We all know that Energy is the capacity to do work. The Energy consumed to do work in unit time is called Power. It is denoted by **P**.

**Power Formula** is given by,

Where,

**E** = Energy Consumed to do work

**W **= Work done and

**t **= Time taken.

In any electrical circuit, the power is calculated using the 3 formulas

In terms of Voltage and current it is given as

In terms of current and resistance it is given as

In terms of voltage and resistance it is given as

I = Current flowing in the circuit and

R = Resistance.

or

In any electrical circuit, the power is calculated using the 3 formulas

Where,

V = voltage applied across the two ends,

V = voltage applied across the two ends,

R = Resistance.

Power formula is used to calculate the Power, Voltage, current or resistance in any electrical circuit. It is expressed in watts.

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Below are some solved problems on Power which help understand these formulas.

Given: Work done = W = 300 J,

Time taken t = 10 s.

Power used by it is given by P = $\frac{W}{t}$

= $\frac{300 J}{10 s}$

= 30 Watts.

Given: mass m = 60 kg,

Height h = 12 m,

time taken t = 40 seconds.

Power is given by P = $\frac{Work\ done}{time\ taken}$

= $\frac{mgh}{t}$

= $\frac{60 \times 9.8 \times 12}{40}$

= 588 Watts.

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