A 20 Picofarad capacitor with a 1 Megohm resistor takes how long to charge?
- 100 microseconds.
- 20 milliseconds.
- 1 second.
Explanation from PART66Online
The time constant tau = RC = 1 Mohm * 20 pF = 1 * 10^6 * 20 * 10^-12 = 20 * 10^-6 s = 20 micros. The capacitor is taken as fully charged after about five time constants, so 5 * 20 micros = 100 micros.
S
sasna asked · 27 Jul 2013
pls solve
Community Comments (1)
P
PART66Online
27 Jul 2013
Full Charge = 5 * Time constant
Time Constant = R * C = (20 / 10000000000000000) * 1000000 = 20 us
Full Charge = 5 * 20 us = 100 us
electronics-tutorials.ws/rc/rc_1.html
Time Constant = R * C = (20 / 10000000000000000) * 1000000 = 20 us
Full Charge = 5 * 20 us = 100 us
electronics-tutorials.ws/rc/rc_1.html
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