Chapter 22, Problem 1STP

To determine

To choose: The correct option.

Answer to Problem 1STP

The correct option is (A), 0.8A.

Explanation of Solution

Given:

A 100-W lightbulb fed with a 120-V supply

Formula used:

The power drawn by the electric bulb P can be expressed in terms of voltage V across it and current flowing through it I as,

  $P=VI$

Calculation:

Having the power and voltage value, the current can be expressed as,

  $I=\frac{P}{V}$

Substituting the value of power and voltage, the current can be calculated as,

  $\begin{array}{c}I=\frac{100}{120}\\ =0.83\text{ A}\\ \simeq 0.8\text{ A}\end{array}$

Conclusion:

Therefore, the correct option representing the current flowing through the bulb is (A), 0.8 A.