Electricity Quiz

What is the primary function of an electric fuse?

• To increase voltage

• To reduce current

• To protect appliances from excess current

• To store energy

The material used in the wire of an electric fuse must have:

• High melting point

• Low melting point

• High resistance

• Low conductivity

Which of the following materials is commonly used for making a fuse wire?

• Copper

• Silver

• Tin-lead alloy

• Steel

A fuse wire is rated at 5 A. What does it mean?

• It will allow current up to 5 A to flow safely.

• It will always maintain a 5 A current.

• It will burn out if the voltage exceeds 5 V.

• It will increase the current in the circuit.

Why is a fuse wire always connected in series in an electric circuit?

• To reduce voltage

• To ensure it breaks the circuit in case of excess current

• To decrease resistance

• To increase current flow

The heating effect of current is caused by:

• Flow of electrons

• Resistance of the conductor

• High voltage

• Low current

The formula for heat produced by an electric current is:

• H=V^2R

• H=I^2Rt

• H=VRt

• H=IRt

In which of the following devices is the heating effect of current not used?

• Electric iron

• Electric bulb

• Refrigerator

• Geyser

A 5 Ω resistor is connected to a 10 V battery for 2 minutes. How much heat is produced in the resistor?

• 200 J

• 240 J

• 2400 J

• 3000 J

Which of the following factors does not affect the heat produced in a conductor?

• Current flowing through the conductor

• Resistance of the conductor

• Time for which current flows

• Length of the conductor