How do you get the formula of power lost?

The formula for power lost in an electrical circuit, primarily due to resistance, can be derived from Ohm's Law and the definition of power. Ohm's Law states that ( V = I \times R ), where ( V ) is voltage, ( I ) is current, and ( R ) is resistance. The power lost, or dissipated as heat, can be calculated using the formula ( P = I^2 \times R ) or ( P = \frac{V^2}{R} ), where ( P ) is power. This shows that power loss increases with the square of the current or inversely with the resistance.