Question

derive the formula p=vi
pls answer fast,its urgent​

Answer 1

Power Formula 2 – Mechanical power equation: Power P = E ⁄ t where power P is in watts, Power P = work / time (W ⁄ t). Energy E is in joules, and time t is in seconds

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Answer 2

Answer:

Hi your answer is as follows,

Explanation:

According to the joule’s law of heating which states that the heat produced is proportional  to the

Square of the current

Resistance of the circuit R

The time t during which the current flows through the circuit.

Mathematically,

$H = I^{2}rt$

Again,

Power is defined as the heat per second.

Therefore,

$power=\frac{H}{t}$

$power=\frac{I^{2} rt}{t}$

$power=I^{2}r$

According to Ohm's Law:

V = IR

Or

$R=\frac{V}{I}$

Put this value in power equation, we get

$power=I^{2} \frac{V}{I}$

Therefore,  

P = VI

Hence, Proved.

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