PB1.Q8.i

In the given circuit, which wire, A or B, should be the live wire?

• A

• B

• Either A or B can be the live wire.

• Neither A nor B should be the live wire.

Why is it important to connect the fuse to the live wire in an electrical circuit?

• To ensure the fuse is the first component in the circuit.

• To ensure that a blown fuse disconnects the appliance from the live potential, making it safer.

• To reduce the overall resistance of the circuit.

• To increase the voltage supplied to the appliance.

In the event of an overload in the given circuit, will the fuse serve its purpose of breaking the circuit?

• Yes, the fuse will blow and break the circuit.

• No, the fuse is not connected correctly and will not protect the circuit.

• The fuse will only blow if both switches are closed.

• The fuse will only blow if both switches are open.

The connection of the switches in the given diagram suggests that they are:

• Single-pole single-throw switches

• Single-pole double-throw (two-way) switches

• Double-pole single-throw switches

• Double-pole double-throw switches

A bulb is rated 600W, 220V. What does the power rating (600W) indicate?

• The total energy the bulb can consume.

• A 600W, 220V bulb is designed to consume 600 Joules of electrical energy per second when connected to a 220V power source, producing a certain amount of light and heat

• The resistance of the bulb.

• The current flowing through the bulb.

What does the voltage rating (220V) of the bulb indicate?

• The maximum voltage that can be safely applied across the bulb.

• The voltage required for the bulb to operate at its rated power.

• The voltage at which the bulb will blow.

• The minimum voltage required for the bulb to light up.

If the bulb is connected to a voltage source lower than 220V, what will happen to its brightness (assuming it still lights up)?

• The bulb will be brighter.

• The bulb will be dimmer.

• The brightness will remain the same.

• The bulb will be dimmer only if the current is also reduced.

The resistance of the filament of the 600W, 220V bulb can be calculated using which of the following formulas?

• R = V/I

• R = V²/P

• R = P/I²

• All of the above