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JA CH.17
| Question | Answer |
|---|---|
| Law of electric charge | states that like objects repel and opposite objects attract |
| Electric force | the force between charged objects |
| Electric field | a region around a charged particle that can exert a force on another charged particle |
| 3 ways to “charge it” | friction, conduction, induction |
| Conservation of charge | because charges cannot be created or destroyed, charge is said to be conserved |
| How can charge be detected? | use an electroscope |
| Conductors | material in which charges can move through easily (ex. Metals) |
| Insulators | material in which charges cannot move through easily ( ex. Rubber) |
| Static electricity | the buildup of electric charge on an object |
| Electrical discharge | the loss of static electricity as charges move off an object |
| Lightning | a source of electricity |
| Lightning rods | a pointed rod that is connected to the ground by a wire |
| Grounded | being connected to the earth |
| Dangerous places when it is lightning includes | beaches, pools, open areas, under large/tall objects |
| Cell | a device that produces an electric current by converting chemical energy into electrical energy |
| Battery | converts chemical energy into electrical energy and is made up of multiple cells |
| Party of a battery | electrolyte and electrode |
| Types of battery cells | wet cells and dry cells |
| What is the relationship between potential difference and volts | potential difference is measured as volts |
| Photocells and examples | the part of the solar pane that converts light energy into electrical energy (ex. Dark strip on a solar powered calculator) |
| Thermocouple | converts thermal energy into electrical energy |
| Two types of electrical current | –AC and DC |
| Alternating Current – | charges continually switch from flowing in one direction to flowing in the reverse direction |
| Voltage – | the difference in energy per unit charge as charge moves between two points in the path of a current |
| Resistance – | the opposition to the flow of electric charge |
| What is the relationship between resistance & current? | Resistance opposes current like friction to motion |
| How thickness, length & temperature affect electrical current – | they affect the types of current |
| What is Ohm’s Law? | shows that the units of current, voltage, and resistance are related |
| Electrical Power Formula | P=V * I |
| Watt | the unit used to express power |
| How is household energy measured by the energy company | multiplying the power of kilowatts by the time in hours |
| Circuit | a complete, closed path through which electric charges flow |
| Load | a device that uses electrical energy to do work |
| What do ALL loads do? | work |
| Explain the relationship that a switch plays in “opening” or “closing” a circuit | to turn on or off something is the process of this |
| Series circuit | a circuit in which all parts are connected in a single loop |
| How many paths are in a series circuit? | it depends on the object |
| Explain what happens if one load in the circuit is malfunctioning | the other loads will not work |
| Parallel circuit | a circuit in which different loads are located on separate branches |
| Why is this circuit important in the wiring of the lights in a building? | the voltage matters for each light bulb |
| Explain what happens if one load in the circuit is malfunctioning. | it will keep running the objects that are working |
| Give an example of a parallel circuit in your house. | an electrical branch of light bulbs, stereos, TVs, etc. |
| Using the last paragraph p. 444 and fig. 26, explain the causes and dangers of overloading a circuit – a circuit failure or short | circuit may occur causing a possible fire or damage of the appliance |
| Explain how a fuse and circuit breakers help with circuit safety in your house and automobile | they help people know when the circuit is being overused and they detect the dangers |
Created by:
PhySciLewis1
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