(a) A 5.0 F capacitor is charge to a potential difference of 20 kV between plate
ID: 1414416 • Letter: #
Question
(a)
A 5.0 F capacitor is charge to a potential difference of 20 kV between plates. After being disconnected from the power source, it is connected across a 7.0 M resistor to discharge.
(i)
What is the initial discharge current?
(ii)
Calculate the time constant of the circuit.
(a)
A 5.0 F capacitor is charge to a potential difference of 20 kV between plates. After being disconnected from the power source, it is connected across a 7.0 M resistor to discharge.
(i)
What is the initial discharge current?
(ii)
Calculate the time constant of the circuit.
Explanation / Answer
here,
capacitance , C = 5 * 10^-6 F
potential difference , V = 20 KV = 20 000 V
resistance , R = 7 Mohm
R = 7 * 10^6 ohm
a)
the initial discharge current , I = V/R
I = 20000 /( 7 * 10^-6)
I = 2.86 * 10^-3 A
b)
the time constant of the circuit , t = R * C
t = 7 * 10^6 * 5 * 10^-6
t = 35 s
the time constant of the circuit is 35 s
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