4.2.2.1 Voltage in parallel circuits BEST

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Diagnostic questions

Parallel circuit

A parallel circuit is a type of electric circuit. A parallel circuit has more than one complete loop. Look at the circuit diagram. Which circuits work in the same way as this circuit? There may be more than one.

3 points

Connecting a voltmeter

Voltage is measured with a voltmeter.The voltage across a battery describes how hard it ‘pushes’ current. The voltage across a branch describes how hard current is ‘pushed’ through it.

Lucas wants to measure the voltage across branch X. How should he connect a voltmeter?

1 point

Clear selection

Parallel circuit voltage rule

Fatima set up this circuit. The resistance of the buzzer is twice the resistance of the bulb. The voltage across the battery is 3.0V.

1) What is the voltage across the buzzer?

1 point

A 3.0 V

B 2.0 V

C 1.5 V

D 1.0 V

Clear selection

2) What is the voltage across the bulb?

1 point

A 3.0 V

B 2.0 V

C 1.5 V

D 1.0 V

Clear selection

Circuits with loops

Alina and Beth have each built an electric circuit. The bulbs in both circuits are bright. Read the statements about the circuits. What do you think about each one?

4 points

I am sure this is right

I think this is right

I think this is wrong

I am sure this is wrong

A Circuit A has three loops that include the battery.

B In circuit A, every bulb is connected straight to both ends of the battery.

C Circuit B is a parallel circuit.

D Both circuits are the same.

Batteries in parallel

1) a) In this circuit, a battery is connected to a resistor. The voltmeter reads 1.5V. A second identical battery is added. What will the voltmeter read now?

1 point

A 3.0V

B 1.5V

C 0.75V

D 0.00V

Clear selection

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

1 point

A Two batteries ‘push’ harder than one.

B The batteries ‘push’ against each other.

C The battery does not need to ‘push’ as hard.

D The voltage across each battery does not change.

Clear selection

2) a) In this circuit, the bulb is lit brightly. What will happen to the brightness of the bulb?

1 point

A It gets brighter.

B It stays the same brightness.

C It gets dimmer.

D It goes out.

Clear selection

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

1 point

A Two batteries ‘push’ harder than one.

B The batteries ‘push’ against each other.

C The voltage across the bulb does not change.

Clear selection

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