4.2.1 Resistance BEST

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Diagnostic questions

Brighter bulb

Philip makes a circuit with one bulb.He adds more batteries to find out what happens to the bulb. Match each circuit to the right light bulb.

4 points

Bulb A

Bulb B

Bulb C

Circuit 1

Circuit 2

Circuit 3

Circuit 4

Resistance

1) Sienna measures the current through different components.She uses an ammeter. She wants to find out which component has the biggest resistance. Which bulb has the biggest resistance?

1 point

Bulb A has a bigger resistance

Bulb B has a bigger resistance

Clear selection

2) Sienna measures the current through different components. She uses an ammeter. She wants to find out which component has the biggest resistance. Which component has the biggest resistance?

1 point

Bulb A has a bigger resistance.

The bulb and the buzzer each have the same resistance.

Buzzer C has a bigger resistance.

Clear selection

Thin wire

a) Wire is made of metal. Most of the wire we use is made of copper. Wire comes in lots of different thicknesses. How is the resistance of thin wire different to the resistance of thick wire?

1 point

A Thin wire has a bigger resistance.

B Thin wire has a smaller resistance.

Clear selection

b) What is the best reason for your last answer?

1 point

A There is less metal for the charge to move through.

B There are fewer metal ions in the way of the charge.

C The wire pipe is narrower.

D There is less metal to use up the charge.

Clear selection

Long wire

Wire is made of metal. The wires bringing electricity to our homes are very long.

The resistance of three wires are compared. The wires have the same thickness. They are different lengths. For each statement, choose one column to show what you think.

3 points

I am sure this is right

I think this is right

I think this is wrong

I am sure this is wrong

A The resistance of each wire is the same.

B The long wire has the biggest resistance.

C The resistance of the short wires adds up to the resistance of the long wire.

Resistance, voltage and current

1) Maya has set up a simple circuit. The battery ‘pushes’ electric charge round the circuit. The bulb has a resistance that makes it harder for charge to move. Which circuit would have 3 × voltage and 2 × resistance compared to Maya's circuit?

1 point

Circuit 1

Circuit 2

Circuit 3

Circuit 4

Circuit 5

Circuit 6

Clear selection

2) Maya has set up a simple circuit. The battery ‘pushes’ electric charge round the circuit. The bulb has a resistance that makes it harder for charge to move. Which circuit would have the same voltage but 3 × resistance compared to Maya's circuit?

1 point

Circuit 1

Circuit 2

Circuit 3

Circuit 4

Circuit 5

Circuit 6

Clear selection

3) Maya has set up a simple circuit. The battery ‘pushes’ electric charge round the circuit. The bulb has a resistance that makes it harder for charge to move. Which circuit would have the same voltage but 2 × resistance compared to Maya's circuit?

1 point

Circuit 1

Circuit 2

Circuit 3

Circuit 4

Circuit 5

Circuit 6

Clear selection

4) Maya has set up a simple circuit. The battery ‘pushes’ electric charge round the circuit. The bulb has a resistance that makes it harder for charge to move. Which circuit would have 3 × voltage but the same resistance compared to Maya's circuit?

1 point

Circuit 1

Circuit 2

Circuit 3

Circuit 4

Circuit 5

Circuit 6

Clear selection

5) Maya has set up a simple circuit. The battery ‘pushes’ electric charge round the circuit. The bulb has a resistance that makes it harder for charge to move. Which circuit would have 2 × voltage and 3 × resistance compared to Maya's circuit?

1 point

Circuit 1

Circuit 2

Circuit 3

Circuit 4

Circuit 5

Circuit 6

Clear selection

6) Maya has set up a simple circuit. The battery ‘pushes’ electric charge round the circuit. The bulb has a resistance that makes it harder for charge to move. Which circuit would have 2 × voltage and 2 × resistance compared to Maya's circuit?

1 point

Circuit 1

Circuit 2

Circuit 3

Circuit 4

Circuit 5

Circuit 6

Clear selection

7) Match the description of each circuit with the current. All of the circuits are compared to Maya's simple circuit.

6 points

0.08A

0.12A

0.16A

0.24A

0.36A

0.72A

3 × voltage, 2 × resistance

same voltage, 3 × resistance

same voltage, 2 × resistance

3 × voltage, same resistance

2 × voltage, 3 × resistance

2 × voltage, 2 × resistance

Hard resistance

a) Sienna measures the current through different components. She uses an ammeter. She wants to find out which has the biggest resistance. Which component has the biggest resistance?

1 point

Buzzer A has a bigger resistance

Bulb B has a bigger resistance

Clear selection

b) Explain your answer to part a).

0 points

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