Chapter 22.1, Problem 4PP

To determine

Energy delivered to starter in given time.

Answer to Problem 4PP

  $E=2.52\times {10}^4\text{J}$

Explanation of Solution

Given:

Battery voltage, $V=12\text{V}$

Current through starter motor, $I=210\text{A}$

Time is 10 s.

Formula Used:

The electrical power is given as, $P=VI$

Where, $P$ is electrical power, $V$ is applied voltage and $I$ is current produced.

And the electrical energy is given as, $E=Pt$

Where, $E$ is energy produced, $P$ is power and $t$ is time.

Calculation:

On substituting the given values in power relation,

  $\begin{array}{c}P=12\times 210\\ =2520\text{W}\end{array}$

Now, on substituting the values in energy relation,

  $\begin{array}{c}E=2520\times 10\\ =2.52\times {10}^4\text{J}\end{array}$

Conclusion:

Therefore, the electrical energy delivered to starter is $E=2.52\times {10}^4\text{J}$ .