Year 8 Physics Chapter 9: Topic 3 Quiz

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What is the purpose of a fuse in an electric circuit?

To protect the circuit from excessive current by melting and breaking the circuit.

What is the difference between a series and parallel circuit?

In a series circuit, components are connected one after the other, and if one component fails, the entire circuit is broken. In a parallel circuit, components are connected between the same two points, and if one component fails, the others remain functional.

What is the role of a switch in an electric circuit?

To control the flow of electric current by breaking or completing the circuit.

What is the purpose of a fuse wire?

To melt and break the circuit if the current exceeds a certain value. Signup and view all the answers

What happens to the brightness of a bulb in a series circuit if one bulb is removed or breaks?

The brightness of the remaining bulbs decreases, and they may even go out. Signup and view all the answers

What happens to the current flowing through a resistor in a series circuit when the resistance of the resistor is increased?

The current flowing through the resistor decreases Signup and view all the answers

Why do lamps in a parallel circuit remain lit even when one lamp is switched off or removed?

Because each lamp has its own separate circuit and the current flowing through each lamp is independent of the others Signup and view all the answers

What is the main advantage of using a parallel circuit in a household?

If one appliance is turned off or faulty, the others will continue to work Signup and view all the answers

Why is the voltage across each component in a parallel circuit the same?

Because the components are connected between the same two points in the circuit Signup and view all the answers

What is the main difference in the way the current flows through a series circuit compared to a parallel circuit?

In a series circuit, the current flows through each component in sequence, whereas in a parallel circuit, the current flows through each component independently Signup and view all the answers