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Ty Phy Sci Ch 17
Introduction to Electricity
| Term | Definition |
|---|---|
| law of electric charges | state that like charges repel and opposite charges attract |
| electric force | the force between charged objects |
| conduction | occurs when electrons are transferred from one object to another by direct contact |
| induction | occurs when charges in an uncharged object are rearranged without direct contact with a charged object |
| conductor | a material in which charges can move easily |
| insulator | a material in which charges cannot easily move |
| static electricity | the buildup of electric charges on an object |
| electric discharge | the loss of static electricity as charges move off an object |
| When objects are rubbed together, friction transfers electrons between them, causing one to become positive and the other negative | Describe how an object is charged by friction. |
| they are both electric discharges that occur quickly and with a flash of light | How is a shock you receive from a doorknob similar to a bolt of lightening/ |
| cell | a device that produces an electric current by converting chemical energy into electrical energy |
| battery | converts chemical energy to electrical energy and contains several cells |
| potential difference | the energy per unit charge; expressed in volts (V) |
| photocell | the part of a solar panel that converts light into electrical energy |
| thermocouple | a device that converts thermal energy into electric energy |
| an electrolyte and two electrodes | What are the parts of a cell? |
| current | the rate at which charge passes a given point |
| voltage | the difference in energy per unit charge as a charge moves between two points in the path of a current |
| resistance | the opposition to the flow of electric charge |
| electric power | the rate at which electrical energy is used to do work |
| circuit | a complete, closed path through which electric charges flow |
| load | a device that uses electrical energy to do work |
| series circuit | a circuit in which all parts are connected in a single loop |
| parallel circuit | a circuit in which different loads are located on separate branches |
| The energy source provides electrical energy; the load is any device that uses electrical energy to do work; wires connect the energy source to the load | Name and describe the 3 essential parts of a circuit. |
| they create gaps in a circuit when the current gets too high, preventing charges from flowing. | How do fuses and circuit breakers protect your home against electrical fires? |
Created by:
beth2244
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