This formula is used in the field of electricity to calculate the energy consumed by an electrical appliance. It relates the energy consumed to the power rating of the appliance, the time it is used, and the voltage and current used by the appliance.


The formula E = P×T ∝ VIt {E = H} is broken down as follows:

• E represents the energy consumed by the appliance, measured in joules (J)


• P represents the power rating of the appliance, measured in watts (W)


• T represents the time the appliance is used, measured in seconds (s)


• V represents the voltage used by the appliance, measured in volts (V)


• I represents the current used by the appliance, measured in amperes (A)


• H represents the energy consumed, measured in watt-hours (Wh) or kilowatt-hours (kWh)

The formula works on the principle of energy conservation. The energy consumed by an appliance is equal to the power rating of the appliance multiplied by the time it is used. However, the voltage and current used by the appliance can affect the amount of energy consumed.


The voltage and current used by the appliance can be combined to give the power rating. This is known as the power factor. The power factor is a measure of how efficiently the appliance uses electricity. Appliances with a higher power factor will consume less energy for the same power rating than appliances with a lower power factor.


The formula E = P×T ∝ VIt {E = H} is an important tool for calculating the energy consumed by an electrical appliance. It takes into account the power rating, time used, voltage, and current, and can be used to determine the efficiency of an appliance. By using this formula, consumers can make informed decisions about their energy consumption and reduce their electricity bills.