Chapter 22, Problem 7STP

To determine

To choose: The correct option.

Answer to Problem 7STP

The correct option is (C), $1.25\times {10}^{-3}\text{ W}$

Explanation of Solution

Given:

A current of 5.00 mA is flowing through a resistor of value 50.0Ω

Formula used:

The power drawn by the resistance is a function of current I and resistance R, which can be expressed as,

  $P=I^{2}R$

Calculation:

Substituting the current and resistance value, the power can be obtained as,

  $\begin{array}{c}P={\left(5\times {10}^{-3}\right)}^2\times 50\\ =1.25\text{ mW}\end{array}$

Conclusion:

Therefore, the correct option representing the power drawn by the resistor is (C), $1.25\times {10}^{-3}\text{ W}$ .