4.1.3.2 Circuit voltage BEST

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Diagnostic questions

Bulb markings

What does ‘3.5V 0.3A’ mean? What do you think about each statement?

5 points

I am sure this is correct

I think this is right

I think this is wrong

I am sure this is wrong

A To light the bulb must be connected to a 3.5V battery

B The bulb will ‘blow’ if you connect it to a 4.5V battery

C The voltage across the bulb is always 3.5V

D To make it work properly, the voltage across the bulb needs to be 3.5V

E The current through this bulb is always 0.3A

Clear selection

Adding components

This circuit is set up and then components are added to see what happens. When adding one 1.5V battery what happens to the bulb?

1 point

The bulb gets dimmer

The bulb stays the same

The bulb goes out

The bulb gets brighter

Clear selection

This circuit is set up and then components are added to see what happens. When adding one 1.5V buzzer what happens to the bulb?

1 point

The bulb gets dimmer

The bulb stays the same

The bulb goes out

The bulb gets brighter

Clear selection

This circuit is set up and then components are added to see what happens. When adding one 1.5V battery and one 1.5V buzzer what happens to the bulb?

1 point

The bulb gets dimmer

The bulb stays the same

The bulb goes out

The bulb gets brighter

Clear selection

This circuit is set up and then components are added to see what happens. When adding one 1.5V battery and two 1.5V buzzers what happens to the bulb?

1 point

The bulb gets dimmer

The bulb stays the same

The bulb goes out

The bulb gets brighter

Clear selection

This circuit is set up and then components are added to see what happens. When adding three 1.5V batteries and three 1.5V buzzers what happens to the bulb?

1 point

The bulb gets dimmer

The bulb stays the same

The bulb goes out

The bulb gets brighter

Clear selection

For each effect on the bulb, choose the best explanation.

3 points

the batteries push harder, the current is bigger

the batteries push less hard, the current is smaller

it is not harder or easier to push current

it is harder to push current, the current is smaller

it is easier to push current, the current is bigger

it is harder to push current, but the batteries push harder

Bulb gets dimmer

Bulb stays the same

Bulb gets brighter

Clear selection

A battery that works

a) Who has the best solution for Jonathan?

1 point

Natalie - The battery needs to be 9V because it has to push the current through the motor and the two bulbs.

Karen - You need a 4V battery to push the current through the motor. That’s not enough to get it through the bulbs as well.

Max - Use a 12V battery so that it lasts for a long time.

Leo - If you take the motor out, both the bulbs will work. You can use a 4V battery for the motor.

Clear selection

b) Explain your answer.

0 points

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