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In a CR circuit after 1 time constant the capacitor will have been charged to
50% of its maximum charge
63% of its maximum charge
86% of its maximum charge
100% of its maximum charge
What is the time constant of a CR circuit with a capacitance 20 microFarads and a resistance of 20kOhms
0.8 seconds
0.4 seconds
40 seconds
80 seconds
High voltage capacitors sometimes have a reistor connected in parallel. The purpose of this is:
To ensure that the capacitor is tuned to the correct frequency
To set up the correct time constant
To stabilise the voltage across the capacitor
To prevent high a high voltage remaining once the equipment is turned off
What is the approximate total capacitance of a circuit in which a 22pF, 40pF and 60pF capacitor are connected in series with two 100pF capacitors connected in parallel?
11pF
232pF
62pF
18pF
A varaible 5-50pF capacitor is connected in parallel with a 12pF capacitor. The resuling capacitor tunes from: