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Q. 67

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 740

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Short Answer

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

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Step by Step Solution

Step 1: Given Information 

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

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