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The quantity symbol for power is P and is the product of voltage multiplied by the current with the unit of measurement being the Watt ( W ). Prefixes are used to denote the various multiples or sub-multiples of a watt, such as: milliwatts ( mW = 10-3W) or kilowatts ( kW = 103W ).
Learn the Power Formula. We’ve seen the formula for determining the power in an electric circuit: by multiplying the voltage in “volts” by the current in “amps” we arrive at an answer in “watts.” Let’s apply this to a circuit example: How to Use Ohm’s Law to Determine Current.
Electric power is the rate at which work is done or energy is transformed into an electrical circuit. Electric power is measured in watts. Learn its definition, formula, unit along with solved examples at BYJU'S.
Define electric power and describe the electric power equation; Calculate electric power in circuits of resistors in series, parallel, and complex arrangements
Definition: Electric Power. The electric power gained or lost by any device has the form \[P = IV.\] The power dissipated by a resistor has the form \[P = I^2 R = \dfrac{V^2}{R}.\]
An electric circuit is capable of transferring power. Current is the rate of flow of charge, and voltage measures the energy transferred per unit of charge. We can insert these definitions into the equation for power:
In electric circuits, power is a function of both voltage and current. Not surprisingly, this relationship bears a striking resemblance to the “proportional” horsepower formula above: In this case, however, power (P) is exactly equal to current (I) multiplied by voltage (E), rather than merely being proportional to IE.
