Physics Unit 6
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| The movement of electrons creates a ________ current. | electric
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| ________ fields are created by electric currents. | Magnetic
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| An electric current runs through a metal spoon and induces ________. | a magnetic field
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| A galvanometer's needle moves in response to a(n) ______. | electric current
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| A voltmeter, a type of galvanometer, measures _______. | voltage
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| You are lost in the woods; luckily, you have an instrument called a(n) ________ that helps you locate your position as its needle points to the magnetic north. | compass
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| Loops in a current-carrying wire make a _______. | solenoid
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| An electric current's strength is measured by a(n) ______. | ammeter
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| To build a(n) _______, you wrap a conducting wire into a coil around a steel or iron core that becomes magnetized by the electric current. | electromagnet
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| A solenoid is positioned between a stationary magnet's poles to produce a(n) ________, an instrument that can measure small electric currents. | galvanometer
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| Who were the two scientists that simultaneously invented electric devices capable of converting electrical energy into mechanical energy? | Michael Faraday and Joseph Henry
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| A ______ magnetic field deflects or repulses the magnetic field created in the wire loop, thereby making the loop rotate. | magnet's
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| ______ receive electric current from the stationary contacts. | Brushes
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| ______ receive electric current from DC power source. | Stationary contacts
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| ______ is produced by the loop's constant rotation, it turns the motor. | Torque
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| A ______ receives electric current from the brushes, which then creates a magnetic field that is repulsed by the magnet's magnetic field. | Wire loop
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| What is the induction of a magnetic field by an electric current? | electromagnetism
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| What is the induction of an electric current in a conductor by magnets? | electromagnetic induction
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| According to ________ ___, a coil's induced voltage is proportional to the product of the coil's number of loops and the rate at which the magnetic field changes. | Faraday's Law
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| What is the formula used to find the input voltage of a transformer? | Ns=Vs
Np Vp
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| To reduce the input voltage from an electrical circuit to operate a machine at the correct input voltage, you need a(n) ______ transformer. | step-down
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| A complete ______ is produced with one revolution of an armature. | cycle
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| A regular AC current in the US operates at _____ Hz or cycles per second. | 60
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| What is the number of turns needed in secondary coil if voltage changes from 240 V to 120 V and the number of turns in the primary coil is 180? | 90
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| What do you use to turn up and down the volume of a voice amplifier? | rheostat
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| You need to determine why a light has gone out in your car interior; you can check to see whether a ______ is burned out. | fuse
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| What do you use to control a larger current by using a smaller current? | relay switch
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| What do you use to ensure that if a circuit overload occurs in your house's electrical system, the house doesn't catch fire? | circuit breaker
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| An advantage of AC current is how easy it is to convert ______. | voltages
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| A disadvantage of _______ is that it is difficult to convert voltages. | DC current
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| If we used DC current today for our residential electricity, we would have to install a __________ on each block. | power station
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| Transmission lines carrying AC current have a low _________ so that they don't overheat. | amperage
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| Transmission lines carrying DC current carried about 100 V and the electricity had to be delivered to the end point within a ______. | mile
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| To generate electricity in the form of AC current, waterfalls, steam derived from burning fossil fuels, or __________ is used. | nuclear power
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| The voltages of AC current are expressed in terms of _________. | DC voltage
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| Every second, ______ fluctuates 60 times, meaning that for 60 "instants" no power is transmitted. | AC current
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| Just before electricity enters a household, it passes through transmission lines going to a ________. | city substation
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| An advantage of AC current is that the voltages in its transmission lines may be stepped up or stepped down by _________ to deliver the correct voltages at their end points. | transformers
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| The battle of AC current vs. DC current ended in _________ being used as our electricity today. | AC current
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| The electricity for AC current is generated in __________. | power stations
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| At one point in history, this individual had a near monopoly on electrical power delivery systems. | Thomas Alva Edison
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| A brilliant scientist from Croatia, ______ performed much of the research that resulted in the successful installation of AC systems. | Nikola Tesla
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| The owner of General Electric, this man promoted the usage of DC current. | Thomas Alva Edison
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| The individual who owned Westinghouse Electric Company and promoted the utilization of AC current was ________. | George Westinghouse
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| Stay away from __________ lines, substations, and any installation designed to handle transmission-level power. | high-voltage
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| If ________ is nearby, follow safety procedures. | lightning
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| Never put anything ________ into an electrical appliance when it is plugged into a wall socket. | conductive
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| Be careful with electrical appliances, especially around _______. | water
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| Be careful around automobile _______. | batteries
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| An AC motor that Nikola Tesla invented was the ________ motor. | polyphase induction
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| Nikola Tesla's understanding that ___________ that were out of phase caused rotation is considered to be one of the ten greatest discoveries of all time. | alternating currents
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| During the development of the first incandescent light bulb, a filament that was cheaper, ______, and more pleasant was sought after. | safer
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| Tungsten, osmium, and carbon were all materials inventors used to compose ________ in early incandescent light bulbs. | filaments
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| When a high temperature causes the emission of visible light by a body such as a light bulb, it is termed ________. | incandescence
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| When a substance that has absorbed light or other electromagnetic radiation of a different wavelength emits light, it is called ________. | fluorescence
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| The inventor who invented the first commercially produced and practical _________ light bulb was Thomas Alva Edison. | incandescent
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| In 1912, Irving Langmuir introduced the idea of installing a coiled tungsten filament joined with __________ in an incandescent bulb's interior to produce a brighter light. | inert gas
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| Scientist _________ applied a metal coating to the filament of an incandescent light bulb's interior to reduce smokiness. | Willis Whitnew
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| A man who believed in Nikola Tesla's work, owned Westinghouse Electric Company, and championed the installation of AC current in the US was ____________. | George Westinghouse
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| Electric energy provides two advantages over other energy forms, including being fairly plentiful and comparatively inexpensive to produce and ________. | transport
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| A frosted interior for light bulbs was invented in 1925 by Marvin Pipkin and _________. | General Electric
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| Two advantages of wind power are that it is __________ and does not _________. | inexhaustible; pollute
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| Three disadvantages of wind power are that it needs ___________, is not __________, and it is _________. | room for tall towers; constant; noisy
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| What source of power has advantages like being inexhaustible, nonpolluting, and used in locations where power grid is not available? | solar power
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| What is a disadvantage of solar power? | expensive
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| What source of power has an advantage of being inexhaustible but a disadvantage of requiring that water must have high potential energy due to gravity? | hydropower
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| If a machine produces electric current or voltage from electromagnetic radiation, especially visible light from the sun, then it is _________. | photovoltaic
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| An advantage of wind, solar, and hydropower is that they are ________. | inexhaustible
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| Frequently, the use of solar-powered devices is in locations where electricity is ___________ from the energy grid. | not available
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| In a photovoltaic cell, electrons in the upper panel move to a ___________ after being hit by sunlight and then flow towards another panel. | higher energy state
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| A main concern in the hunt for new energy sources is that they do not _________ the earth. | pollute
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| When electrons move, they produce a(n) __________ current. | electric
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| An electric current may be measured by three instruments: a galvanometer, an __________, or a voltmeter. | ammeter
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| A changing electric field in the form of an electric current creates a magnetic field is due to the phenomenon of _________. | induction
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| To induce magnetism in a spoon, you run a(n) _____________ through it. | electric current
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| A(n) __________ is a type of galvanometer that measures voltage. | voltmeter
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| A compass' needle points to the __________. | magnetic north
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| Making loops in a current-carrying wire creates a(n) __________. | solenoid
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| An ammeter measures and electric current's strength in ________. | amperes
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| Once a conducting wire is wrapped into a coil around a(n) __________, the wire's electric current magnetizes it, and you create an electromagnet. | iron core
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| A galvanometer is produced by positioning a _________ between a stationary magnet's poles. | solenoid
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| A magnet's south pole is attracted to the north pole of another _______ due to an attraction called magnetism. | magnet
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| Scientists Joseph Henry and Michael Faraday invented electric devices that converted _____________ into mechanical energy. | electrical energy
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| A _________ provides a DC power source for a DC motor. | battery
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| Every half revolution of the wire loop in a DC motor _________ reverses the current, thereby changing the direction of the magnetic field of a DC motor's wire loop. | armature
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| The ____________ in a DC motor's magnet deflects or repulses the wire loop's magnetic field created and as a result, makes the loop rotate. | magnetic field
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| Electric current travels from the stationary contacts to the ________. | brushes
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| The DC power source delivers electric current to the ___________. | stationary contacts
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| The loop's constant rotation creates ______ that turns the DC motor. | torque
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| The brushes send electric current to the _________, which then creates a magnetic field that the magnet's magnetic field repulses. | wire loop
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| What protective device prevents circuit overloads from causing fires? | circuit breaker
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| What protective device burns out in cars? | fuse
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| What device enables you to change volumes in amplifiers? | rheostat
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| What device enables you to deal with a smaller current instead of a larger current? | relay switch
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| It is easy to convert the voltages in _________. | AC current
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| The transmission lines that carry AC current have a low _______, so they overheat. | amperage
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| It is difficult to convert the voltages in ________. | direct current
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| In our country's history, there was a battle between whether we would use AC or DC current; ____ current's advantages were responsible for its use today. | AC
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| AC current voltages may be stepped up or stepped down by _______. | transformers
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| _________ held a monopoly on electrical power delivery systems for a while, promoted DC systems, invented the first practical incandescent light bulb, and owned General Electric. | Thomas Alva Edison
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| Who is the man who owned Westinghouse Electric Company and championed the use of AC current? | George Westinghouse
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| Who is the Croatian scientist who did much research on AC systems and motors? | Nikola Tesla
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| Scientists around the world are seeking __________ energy sources. | renewable
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| The production of electric energy has depleted large amounts of resources, plus it produces ________. | pollution
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| In early incandescent light bulbs, 98% of the energy was converted into ________, not light. | heat
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| _________ is generated due to the kinetic energy of falling water. | hydroelectricity
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| Power derived from hot rocks is _________ energy production. | geothermal
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