Page 41 - Basic Electrical Engineering
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Thus in a circuit if I is the current flowing, and V is the applied voltage
across the terminals, power, P is expressed as
Thus electrical power can be expressed as
1.8.3 Energy
Energy is defined as the capacity for doing work. The total work done in an
electrical circuit is called electrical energy. When a voltage, V is applied, the
charge, Q will flow so that
If power is in kW and time is in hour, the unit of energy will be in Kilowatt
hour or kWh.
1.8.4 Units of Work, Power, and Energy
In SI unit, work done is the same as that of energy.
Mechanical work or energy
