Capacitance

The video tutorial explains how capacitors store electric potential energy in an electric field, using a camera flash as an example. It defines capacitance, discusses the work needed to separate charges, and explains the units and symbols used. A demonstration with a disposable camera shows how a capacitor is charged and discharged, converting stored energy into light and heat. Safety precautions are emphasized during the demonstration.

What is the primary function of a capacitor in an electric field?

• To generate electric current

• To store electric potential energy

• To increase electric resistance

• To convert electric energy to mechanical energy

Which factors determine the capacitance of a capacitor?

• The current flowing through the capacitor

• The temperature of the environment

• The voltage applied across the capacitor

• The physical characteristics of the capacitor

Why is the net charge on a capacitor considered to be zero?

• Because it only stores positive charges

• Because the capacitor is always grounded

• Because it only stores negative charges

• Because the charges on the plates cancel each other out

What is required to separate charges onto the plates of a capacitor?

• A vacuum

• A magnetic field

• Work

• A high temperature

How is the work done in separating charges in a capacitor similar to lifting a mass in a gravitational field?

• Both add potential energy to the system

• Both decrease the system's energy

• Both require a magnetic field

• Both involve converting kinetic energy

What happens when a metal paper clip is placed across the terminals of a charged capacitor?

• The capacitor's charge remains unchanged

• The capacitor discharges, converting energy to light and heat

• The capacitor becomes a permanent magnet

• The capacitor charges further

What safety precaution is advised during the capacitor demonstration?

• Wear gloves to prevent electric shock

• Avoid touching the terminals to prevent burns

• Ensure the capacitor is fully discharged before use

• Use a higher voltage battery for better results