Question

Write formula for electric power in terms of current and resistance R.

Answer 1

Step 1: Given data,

$$\begin{gathered} Current=I \\ Resis\tan ce=R \end{gathered}$$

Step 2: Finding the formula for electric power,

Electric power is the product of voltage and current.

Power $=voltage\times current$

$P=V\times I$ _____ (i)

As we know from Ohm's law, voltage$V=IR$

Putting in eg. (i)

$$\begin{gathered} P=\left(IR\right)\times \left(I\right) \\ P=I^{2}R \end{gathered}$$

Hence, the formula for electric power in terms of current and resistance is $P=I^{2}R$.