| Question |
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| Answer |
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| Define electrodynamics. |
The science of electric charges in motion. |
| Under what conditions does an electric current consists of a flow of charged particles? |
Gas, Ionic solution, Metallic conductor, Vacuum |
| What are the two sources of electric current? |
Cells/Batteries and Dynamo/Generator |
| Define potential difference. |
Difference in electrical potential energy between 2 points in an electric circuit. |
| What is the UNIT of potential difference? |
Volt |
| Define volt. |
Potential difference maintaining a current of ampere in a circuit whose resistance is 1 ohm. |
| Define electromotive force. |
The maximum difference of potential between the terminals of a battery. |
| Define current. |
Amount of electric charge flowing per second. |
| What is the UNIT of current? |
Ampere |
| What is an ampere? |
1 coulomb quantity of electric charge flowing per second. |
| Define resistance. |
Property of circuit opposing or hindering flow of electric current. |
| What is the UNIT of electrical resistance? |
OHM |
| Define OHM. |
The resistance of a standard volume of mercury under standard conditions. |
| On what factors does the resistance of a conductor depend? |
Material, Length, Cross-sectional area, and Temperature |
| Define dry cell. |
Used in flashlights, consists of carbon rod surrounded by manganese dioxide, immersed in ammonium chloride paste, zinc chloride, water. |
| Define wet cell. |
Consists of hard rubber or plastic case containing sulfuric acid with immersed electrodes. |
| How does temperature affect metal conductors? |
The resistance becomes greater as the temperature rises. |
| Define OHM's law. |
The value of the current in a metallic circuit equals the potential difference divided by the resistance. |
| Define ammeter. |
Meter that measures in amperes. (in series) |
| Define voltmeter. |
Meter that measures, involts, the potential difference between any two points in a circuit. (in parallel) |
| What is the unit of power? |
Watt |
| What is the equation for power loss? |
P = I 2 R watts |
| What is the formula that defines power loss in an electrical circuit? |
P = I 2 R |
| A gasoline engine will convert chemical energy to what type of energy? |
Mechanical energy |
| What type of charge moves in a conductor? |
Negative charges |
| What effect does a low temperature have on resistance? |
Decreases |
| What effect does a high temperature have on resistance? |
Increases |
| What is measured by a meter wired in series with a resistance? |
Current |
| Electric insulators inhibit movement of what? |
Electric charge |
HHS Shrek
