Question

You are asked to design an RC circuit for a camera flash. You want the flash...

  1. You are asked to design an RC circuit for a camera flash. You want the flash to be ‘on’ for around the same time as the shutter of the camera is open, which is about 60 ms. You are using a bulb that will break if more than 0.5 A flow through it. For the flash to be powered by 2 AA batteries (1.5 V each), what combination of resistors and capacitors should you use? Assume the flash is an ohmic resistor.

Homework Answers

Answer #1

Time for which the flash to be on is equal to the time constant of RC circuit.

Time constant of RC circuit, = RC

Where, R-resistance, C- capacitance

Given, = 60ms = 0.060s

RC = 0.060

The maximum current the bulb can withstand is Io = 0.5 A

In a RC circuit, the maximum current, Io = E/R

Where E is the voltage of the battery and E = 1.5 + 1.5 = 3 V

Io = E/R ; 0.5 = 3/R

R = 3/0.5 = 6

R = 6Ω

RC = 0.060

6C = 0.060

C = 0.060/6 = 0.01 F

A resistor of R = 6Ω and capacitor of C = 0.01 F should be used

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