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### 25 Cards in this Set

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• Back
 Current the rate at which current passes a given point Ampere unit for current I symbol for current Direct current current where charges flow in the same direction Alternating current current where the charges continually switch directions Voltage the difference in energy per unit charge as a charge moves between two points in a current volts unit for voltage V symbol for voltage Resistance the opposition to flow of electric charge Ohms unit for resistance R symbol for resistance Which wire width has more resistance? thin Which length of wire has more resistance? longer Does a higher temperature, increase or decrease wire resistance? increase which direction do electrons flow? From higher potential to lower potential Name the device to measure current, voltage and resistance. ammeter, voltmeter, ohmmeter Circuit a complete, closed path through which electric charges flow Name the 4 parts of a circuit. energy source, connecting wires, load, switch Load a devise that uses electrical energy to do work switch open and closes a circuit Series circuit circuit in which all parts are connected in a single loop Parallel circuit a circuit in which different loads are located on separate branches Short circuit charges bypass the loads and the current increases Fuse Safety devise that coantins a thin metal strip that melts when the current is too hign to shut it down Circuit Breaker Saftey devise that contains a thin metal strip that heats and bends away from wires shutting down current when it is too high