Q. 67

Expert-verifiedFound in: Page 740

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

Camera Voltage

Time

Power

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

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