Power measures the rate at which energy is transferred by a device, often expressed in terms of energy per second. This means that a more powerful device will transfer more energy over a period of time.
We can calculate the power transferred in a device or appliance using the potential difference and current. The equation is:
However, if we don’t know the potential difference value, we can also calculate power using the current and resistance of the device or appliance.
Every electrical appliance transfers energy from one store to another. Whenever charge flows in a circuit, electrical work is done.
How much energy is transferred by an electrical appliance depends on:
We can calculate the energy transferred by an appliance using the equation: