Capacitors in a DC Circuit
34 Capacitors are used extensively in electronics. They are used in both alternating current (AC) and DC circuits. Their main use in DC electronics is to become charged, hold the charge, and, at a specific time, release the charge.
The capacitor shown in Figure 1.15 charges when the switch is closed.
To what final voltage will the capacitor charge? _____
It will charge up to 10 volts. It will charge up to the voltage that would appear across an open circuit located at the same place where the capacitor is located.
35 How long does it take to reach this voltage? This is an important question with many practical applications. To find the answer you must know the time constant (τ) (Greek letter tau) of the circuit.