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Electrical Circuits

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Problem 17
25 kohm

Neon lamp 4 μF 110V

a) Voltage across the capacitor at any instant t after it starts charging up is given by :

V = Vm(1 - e-t/RC) where Vm = Max voltage = 110 V, R = 25 kohm, C = 4 μF

RC = 25x103x4x10-6 = 0.1

Or V = 110 (1 - e-t/0.1)

To determine the time taken for the capacitor to charge up to a voltage of 75 V, we substitute V = 75 V in the above equation and solve for t.

75 = 110 (1 - e-t/0.1) or e-t/0.1 = 0.318

Taking loge of both the ...

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Step-by-step solution provided that discusses electrical circuits.

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