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Electrical Power & Energy

Electrical power and energy are fundamental concepts in electrical engineering and are crucial for understanding how electrical systems operate and consume energy.

Electrical Power

Definition: Electrical power is the rate at which electrical energy is transferred by an electric circuit. It is measured in watts (W).

Formula: The basic formula to calculate electrical power is:

P=V×I

where:

• $P$ is the power (measured in watts, W)
• $V$ is the voltage (measured in volts, V)
• $I$ is the current (measured in amperes, A)

Electrical Energy

Definition: Electrical energy is the total amount of work done by electrical power over a period of time. It is measured in joules (J) or watt-hours (Wh).

Formula: The basic formula to calculate electrical energy is:

E=P×t

where:

• $E$ is the energy (measured in joules, J or watt-hours, Wh)
• $P$ is the power (measured in watts, W)
• $t$ is the time (measured in seconds, s or hours, h)