Power for a resistor (18-24)

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Question

Power into a resistor

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Review

For the special case where the circuit element is a resistor with resistance $R$ , Equation 18-9 tells us that the voltage $V$ across the resistor is equal to the product of the current and the resistance: $V = iR$ , or equivalently $i = V/R$ . We can use these two expressions to rewrite Equation 18-23 in two equivalent forms for the special case of a resistor:

$P = i(iR)$ or $P = \left(\frac{V}{R}\right)V$

We can simplify these to