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