Nishu Asks:

How to use different formulas of power ( $frac{V^2}{R}$, $V cdot I$, $I^2 cdot R$ ) at different situations.

*Power of a heater*How to use different formulas of power ( $frac{V^2}{R}$, $V cdot I$, $I^2 cdot R$ ) at different situations.

Likewise, for instance, i have a heater of 1000W which converts 220 V to power(Heat) in some infrared region, if i calculate output power using $Vcdot I$, it seems okay, but when i calculate power using $frac{V^2}{R}$, since there is a coil of high resistance, output power seems surprisingly small.

May be it seems a basic question, but it made me confused.

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