Quiz on Capacitance

What is capacitance?

• The charge on the plates of the capacitor per unit P.d.

• The resistance in a circuit

• The voltage supplied to a capacitor

• The current flowing through a capacitor

What is the formula for combined capacitance of capacitors in series?

• V = QC

• Ctotal = C1 + C2 + C3

• Q = CV

• C = Q / V

What is the effect of changing the resistance in the circuit when discharging a capacitor?

• Increased charge flow

• Increased voltage

• Decreased time to discharge

• Decreased current

What is the time constant of a circuit equal to?

• RC

• R + C

• 1/RC

• C/R

What is the formula for exponential decay of charge on a capacitor?

• I = I0 e^(t/RC)

• V = V0 e^(-t/RC)

• I = I0 e^(-t/RC)

• Q = Q0 e^(-t/RC)

What happens when the capacitor discharges through a resistor?

• Potential difference increases

• Current remains constant

• Voltage across the capacitor decreases

• Charge flows off the capacitor

What is the formula for the energy stored in a capacitor?

• V = QC

• Q = CV

• W = 1/2CV^2

• W = 1/2QV

What is the formula for the charge stored on a capacitor?

• Q = V / C

• V = Q / C

• C = Q / V

• Q = CV