Q. 67

Expert-verified
Found in: Page 740

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# The flash unit in a camera uses a battery to charge a capacitor. The capacitor is then discharged through a flashlamp. The discharge takes , and the average power dissipated in the flashlamp is . What is the capacitance of the capacitor?

The capacitance of the capacitor is

See the step by step solution

Camera Voltage

Time

Power

## Step 2: Explanation

The energy provided by a capacitor with capacitance charged to potential difference is given by

From this we can express the capacitance as

We can calculate the capacitance stored in a capacitor by calculating the average power discharged and the time duration is,

Substituting this expression at the one for the capacitance we find

Then the expression will be,

Substitute the values,

Hence, the capacitance of the capacitor is