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The flash light of a camera is produced by discharging a capacitor across the la

ID: 3163877 • Letter: T

Question

The flash light of a camera is produced by discharging a capacitor across the lamp. Why is the photoflash lamp not just connected directly to the power supply that charges the capacitor? Whys is the capacitor used? A battery, a resistor and a capacitor are connected in series. The resistor does not affect the amount of the charge that the capacitor stores. What purpose does the resistor thus serve? A capacitor is found to leak charge over time. Model this leaking capacitor with the right combination of circuit elements. What does the leak time depend on? Equipment: The following equipment will be supplied. A multimeter A 30-V DC power supply Circuit elements (resistors, capacitors etc.) oscilloscope Cable sets

Explanation / Answer

Camera flash light is produced with very high voltage and current but with very short duration of time. So the transfer of energy has to be taken place in very short time i.e. in adiabatic manner so the efficiency will be almost close to zero.

Where as batteries supply the energy with less voltage and current (in a controlled manner) for long intervals of time to the capacitors.

2) In RC circuit, if we have only battery and capacitor, we have continuous flow of current from capacitor to battery also which will be opposed by keeping the resistor.

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