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