Understanding Capacitors and Their Uses

What is the unit of capacitance?

• Ohm

• Farad

• Coulomb

• Volt

If a capacitor is charged to a potential difference of 10 volts and has a capacitance of 2 farads, what is the charge stored in the capacitor?

• 5 coulombs

• 10 coulombs

• 20 coulombs

• 40 coulombs

Which of the following equations correctly represents the energy stored in a capacitor?

A capacitor is charged to a potential difference of 5 volts and stores an energy of 25 joules. What is the capacitance of the capacitor?

• 1 farad

• 2 farads

• 4 farads

• 10 farads

Which of the following is a common application of capacitors in electronic circuits?

• To amplify signals

• To store energy

• To convert AC to DC

• To increase resistance

In which of the following devices are capacitors used to maintain power supply during short power interruptions?

• Mobile phones

• Uninterruptible Power Supplies (UPS)

• Electric heaters

• LED lights

If a capacitor has a capacitance of 3 farads and is charged to a potential difference of 12 volts, what is the energy stored in the capacitor?

• 18 joules

• 36 joules

• 72 joules

• 216 joules