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Electricity Definitions
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Terms in this set (12)
Electromotive force
Electrical energy transformed from other forms per unit charge
Mean Drift Velocity
The average displacement travelled by the electrons along the wire per unit time opposite to the direction of conventional current flow
Internal resistance
The loss of voltage in the battery per unit current. The resistance of the internal components of a battery.
Kilowatt-hour
The energy transferred when a machine with a power of 1 kW operates for a time of 1 hour
Kirchhoff's First Law
The total current into a junction equals the total current out (charge is conserved)
Kirchhoff's Second Law
The sum of e.m.f 's equals the sum of p.d 's around a closed loop in a circuit (energy is conserved)
Ohm's Law
For a conductor at constant temperature, the current flowing through the conductor is directly proportional to the potential difference across it.
Potential difference
The energy transferred per unit charge from electrical to other forms
Power
Energy transferred per unit time
Resistance
Potential difference/current
Resistivity
(Resistance x Cross-Sectional Area)/Length of the wire
Watt
One watt is the power used when one joule of energy is transferred per second
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