Year 8 Physics Chapter 9: Topic 3 Quiz
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Questions and Answers

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?

<p>To melt and break the circuit if the current exceeds a certain value.</p> 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?

<p>The brightness of the remaining bulbs decreases, and they may even go out.</p> 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?

<p>The current flowing through the resistor decreases</p> Signup and view all the answers

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

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

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

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

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

<p>Because the components are connected between the same two points in the circuit</p> 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?

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

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