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# Electrodynamics

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

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