Chapter 22, Problem 8STP

To determine

To choose: The correct option.

Answer to Problem 8STP

The correct option is (D), $\text{5}\text{.4}\times {10}^5\text{ J}$ .

Explanation of Solution

Given:

A 60-W lightbulb is used for duration of 2.5 hours

Formula used:

The energy consumed by the lightbulb, E can be expressed in terms of the power dissipation and the time for which power is drawn, t, as

  $E=Pt$

Calculation:

Substituting the value of power and time, the energy can be calculated as,

  $\begin{array}{c}E=60\times 2.5\times 60\times 60\\ =5.4\times {10}^5\text{ W/s}\\ \text{=5}\text{.4}\times {10}^5\text{ J}\end{array}$

Conclusion:

Therefore, the correct option representing the energy delivered to the bulb is (D), $\text{5}\text{.4}\times {10}^5\text{ J}$ .