Electrodynamics
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| Define electrodynamics. | The science of electric charges in motion.
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| Under what conditions does an electric current consists of a flow of charged particles? | Gas, Ionic solution, Metallic conductor, Vacuum
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| What are the two sources of electric current? | Cells/Batteries and Dynamo/Generator
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| Define potential difference. | Difference in electrical potential energy between 2 points in an electric circuit.
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| What is the UNIT of potential difference? | Volt
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| Define volt. | Potential difference maintaining a current of ampere in a circuit whose resistance is 1 ohm.
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| Define electromotive force. | The maximum difference of potential between the terminals of a battery.
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| Define current. | Amount of electric charge flowing per second.
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| What is the UNIT of current? | Ampere
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| What is an ampere? | 1 coulomb quantity of electric charge flowing per second.
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| Define resistance. | Property of circuit opposing or hindering flow of electric current.
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| What is the UNIT of electrical resistance? | OHM
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| Define OHM. | The resistance of a standard volume of mercury under standard conditions.
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| On what factors does the resistance of a conductor depend? | Material, Length, Cross-sectional area, and Temperature
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| Define dry cell. | Used in flashlights, consists of carbon rod surrounded by manganese dioxide, immersed in ammonium chloride paste, zinc chloride, water.
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| Define wet cell. | Consists of hard rubber or plastic case containing sulfuric acid with immersed electrodes.
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| How does temperature affect metal conductors? | The resistance becomes greater as the temperature rises.
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| Define OHM's law. | The value of the current in a metallic circuit equals the potential difference divided by the resistance.
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| Define ammeter. | Meter that measures in amperes. (in series)
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| Define voltmeter. | Meter that measures, involts, the potential difference between any two points in a circuit. (in parallel)
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| What is the unit of power? | Watt
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| What is the equation for power loss? | P = I 2 R watts
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| What is the formula that defines power loss in an electrical circuit? | P = I 2 R
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| A gasoline engine will convert chemical energy to what type of energy? | Mechanical energy
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| What type of charge moves in a conductor? | Negative charges
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| What effect does a low temperature have on resistance? | Decreases
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| What effect does a high temperature have on resistance? | Increases
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| What is measured by a meter wired in series with a resistance? | Current
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| Electric insulators inhibit movement of what? | Electric charge
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Created by:
rad1958tech
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