Discharging Capacitors
Using the equation for charge stored in a capacitor at time t explain why the discharge time of a capacitor is independent of its initial charge
I've got no idea how to do this.. Please Help! 😂
I've got no idea how to do this.. Please Help! 😂
Original post by Moonie96
Using the equation for charge stored in a capacitor at time t explain why the discharge time of a capacitor is independent of its initial charge
I've got no idea how to do this.. Please Help! 😂
I've got no idea how to do this.. Please Help! 😂
Is that the complete question exactly as written?
sure it wasn't asking about the 'time constant'
Original post by Joinedup
Is that the complete question exactly as written?
sure it wasn't asking about the 'time constant'
sure it wasn't asking about the 'time constant'
That was definitely all that was written, I know it wants me to use Q=Q(initial charge)e^(-t/RC) but Im not sure what to do with it
I'll call the starting charge at t=0 Q0
what you can say is that Q/Q0=e^(-t/RC)
so you're well set to tackle questions asking you about the time for the Q to drop to any fraction of Q0. e.g. half ,1/10th etc.. but for Q to become equal to zero, which is what the question seems to be asking, that is a bit tricky because as x increases e^(-x) gets closer to zero but never reaches zero.
what you can say is that Q/Q0=e^(-t/RC)
so you're well set to tackle questions asking you about the time for the Q to drop to any fraction of Q0. e.g. half ,1/10th etc.. but for Q to become equal to zero, which is what the question seems to be asking, that is a bit tricky because as x increases e^(-x) gets closer to zero but never reaches zero.
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