Question

Many electronics can be dangerous even after they are shut off. Consider an a RC circuit of 160.uF and a 1.10M ohms resistor connected to a 240 -V power source for a long time and then disconnected and shorted as shown in the figure how long will it be until the potential difference across the capacitors drops below 70 V

lUhics devices can be dangerous even after they are shut off. con an RC circuit with a 160.-uF capacitor and a 1.10-Ma resistor connected to a 240.V source for a long time and then disconnected and shorted, as shown in the figure. H it be until the potential difference across the capacitor drops to below 70.0 e shut off. Consider Vpower ow lo long will V?

Answer 1

voltage at any time t is given by

$V=V_{0}(1-e^{-t/rc})$

where Vo = 240

rc = 176

hence V =70 volt

at time t = 60.69 sec