Capacitors and Capacitance - Concept Check

Capacitors are devices used to store _________.

• charge

• electrons

• electrical energy

• potential difference

In electrical circuits, capacitors are used for

• smoothing circuits

• store energy

• tuning circuits

• all of the above

A capacitor is fully charged when the p.d. across the capacitor is equal to the e.m.f. of the power supply.

• True

• False

In a parallel plate capacitor, the amount of charge "stored" in a capacitor refers to the amount of charge on each plate.

The amount of charge on each plate is equal but opposite to each other.

Hence, the overall charge on the capacitor is 0. (Capacitor does not store charge)

• True

• False

What is Capacitance?

• Electrical energy per unit charge

• Charge per unit electrical energy

• Charge per unit p.d.

• P.d. per unit charge

The units for capacitance is...

• Charge per p.d.

• coulombs

• volts

• Farads

The diagram shows the expression for combined capacitance arranged in series.

Which of the following is the correct expression for combined capacitance arranged in parallel?

• C = C₁ + C₂ + C₃

• C = C₁ x C₂ x C₃

• C = 1/(C₁ + C₂ + C₃)

• C = C₁ - C₂ - C₃