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electromagnestism

study omg i need an A

QuestionAnswer
Which configuration would produce an electric current? Rotate a coil of copper wire between two magnets
The electrical conductivity of a substance depends on the ability of the ____ in it to move. electrons
What process is the method by which a neutral object obtains an electrical charge? induction
A circuit contains three light bulbs in parallel. After observation, a fourth light bulb is added, also in parallel. How does the intensity of the four light bulb circuit compare with the intensity of the three light bulb circuit? It has the same intensity.
Pretend you are an electron in a copper wire which is being used to connect a battery to a flashlight bulb. Because this circuit uses a(n) ___________________ current, you as the electron in the wire will direct, move only in one direction.
several directional compasses, several lengths of wire, an iron nail, a battery, an ammeter, a light bulb,a permanentmagnet, severalmetalpaperclipsandarubbereraser.buildanddem.a workingtempmagnet.itemsonthetablewhichitemscanbe usedtogethertoaccplomishthis A battery, an iron nail, a wire and several paper clips will accomplish this task.
most small electric motors, the magnets that are around the central rotor (the field magnets) are _________________. The magnet in the center is a(n) ____________________. permanent magnets, electromagnet
All of the following use an electric motor, EXCEPT radio.
You rub a balloon on your head and it becomes negatively charged. The balloon will be MOST attracted to positively charged hair.
Which circuit contains the GREATEST voltage? A circuit with 25 amps and a resistance of 16 ohms
A battery-operated DVD player uses 12 DC volts from AA batteries and draws a current of 3 A. Calculate the resistance. 4 ohms
What is the voltage in a circuit if the current is 6.2 A and the resistance is 18 ohms? 111.6 V
There is a single path for electrons. The current decreases when additional resistors are added. The current will be the same in each resistor. These statements BEST describe a(n) _____________ circuit. series
The voltage in each path is the same. There is more than one path for electrons to reach resistors. The total current in a circuit will increase when a path is added. These statements are all true for ___________ circuits. parallel
Why might an electromagnet be used to pick up old cars in junk yards? Electromagnets are powerful and can be turned on and off easily.
Chemical, potential energy is stored in a battery. The negative end of a battery is connected to a wire. The wire loops numerous times around a piece of steel. The wire returns to the positive end of the battery. What happens to the piece of steel? It moves toward a piece of iron.
Friction, conduction and induction are three ways of creating a static charge on an object. Which method or methods will produce the same charge on two objects? Conduction only
After turning off the television, you approach it. As you get close, but not touching it, the hairs on your arm start to stand up. This is an excellent example of static charge built up by induction.
Which is an example of gaining a static charge by conduction? Touching your car on a cold day and getting a shock.
Lightningisofstaticelectricity.thundercloud,moisturecausesthecloudtogetheavierandmoveclosertotheearth.Asitdoes,thecloudrubstheatmosphereandremoveselectrons.Thebottomofthecloudbecomesnegativelychargedandthetopbecomespositivelycharged.Theelectronsontheearth induction
There are three ways to give an object a static charge. They are friction, conduction and induction. A student states has two charged objects. She states that one was charged by the other by induction. What observation would support that statement? The two objects are oppositely charge
Static charges can be applied to neutral objects by friction, induction or conduction. What do all of these methods transfer to obtain this charge electrons
Mike wants to negatively charge a small rubber ball. Which of these methods would successfully charge the ball? rubbing the ball back and forth on carpet
When an object gains or loses electrons, it becomes electrically charged.
Sal and Marie were experimenting with bar magnets in science class, picking up chains of paper clips. Where should they expect the magnetic force of the bar magnet to be the strongest and pick up the most paper clips? at both Poles
Producing an electric current by moving a bar magnet in and out of a coil of wire is called electromagnetic induction.
A series circuit contains four light bulbs. The switch is opened and one of the bulbs is removed, but not replaced. Then the switch is closed again. What would you expect to see? None of the remaining light bulbs will be on.
Which statement is TRUE? In a series circuit, as light bulbs are added, the bulbs dim.
During physical science class, Ben and Jerry connected three identical light bulbs in parallel to a battery. What happens when Ben removes one of the light bulbs from its socket? The other light bulbs remain on and will be equally bright.
An advantage of parallel circuits is that they allow current to flow even if some paths are cut
Turning a magnet very quickly would be BEST used to create an electric current.
A coil of wire, a battery, a few paper clips, and a thermometer are on a table of supplies. What other material or materials would be needed for a student to construct a basic electric motor? A magnet
The circumstance MOST LIKELY to cause a compass to give an erroneous reading is standing too close to an electric power line.
In this electric motor, an electric current causes the coil to rotate, changing electrical energy to mechanical energy.
Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails? iron nail
In 1831, Michael Faraday was the first to realize that an electric current could be induced by passing a magnet through a coil of copper wire. Which factor is MOST essential for the induction of the electric current? the movement of the magnet relative to the coil
Twocompanies, H Industries and Kuhlman Electric Company, are responsible for most of the transformers and power grids produced in the United States and shipped world-wide. What role does a transformer play in the supply of electricity over long distances? Transformers increase voltage before transmitting electrical energy economically over long distances through wires
What is produced by moving a permanent magnet through a coil of copper wire? electricity
A generator produces electricity by moving a permanent magnet through a coil of copper wire. How does this create an electrical current? The magnet pushes on the free electrons in the wire and a current is produced.
A scientist is giving a demonstration with a Van de Graaff generator in a class about electrostatics. The scientist can detect the type of charge on the Van de Graaff generator by bringing a positively charged balloon near it.
When a student combed his dry hair for a long time, his hair began to stand up. Which of these has MOST LIKELY happened? The comb and hair have become charged with opposite charges.
In a classroom experiment, a student rubs a comb against her hair. The comb is then brought near bits of paper resting on a surface. Which of these can be concluded if the comb picks up the bits of paper? The comb had a net charge on it, and it attracted a neutral object.
When we touch a Van de Graaff generator, our hair may stand up if it is dry. This happens only if the strands of our hair repel each other.
When Jamie removes a woolen cap, his hair develops an excess of static charge Which of these BEST explains this phenomenon? Electrons are transferred from Jamie’s hair to the woolen cap.
When a balloon is rubbed with human hair, the balloon acquires an excess static charge. This implies that some materials can give up electrons more readily than others.
A series circuit includes a battery and a tiny fan. How will the circuit behave if closed? The fan will blow.
A light bulb, a fan, and a tiny speaker are connected to a battery in a series circuit. How will the circuit behave if it is open? None of the devices will work.
A strand of 10 lights is plugged into an outlet. How can you determine if the lights are connected in series or parallel? Unscrew one light. If the other lights turn off, it's a series circuit.
blowing up some balloons for birthday party.sistergrabbed aballoonandrubbeditonhisheadBilly'shairbegantostickupinlittlespikesalloverhisheadThentooktheballonandputitupagainstthewall.t stuck!Billy's hair stood up and the balloon stuck to the wall because of static electricity.
Westinghouse and Edison fought what was known as the war of the currents. Eventually, Westinghouse triumped using Alternating Current for power distribution. Alternating current is better for power generation because alternating current produces flutuating magnetic fields.
Most electrical power generation (except for solar) converts motion into electricity using a generator. The two required components for a generator are a coil of wire and a magnet in relative motion to induce an electric current.
Created by: evangelynnm
 

 



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