Electricity Year 8

What is the name of the piece of wire inside a bulb that glows when current flows through it?

• lead

• fuse

• filament

If the bulb on the left breaks what happens to the other bulb?

• It gets brighter

• It switches off

• It stays the same brightness

• It becomes dimmer (but still on)

What is the name of the particles that flow through metal wires when a voltage is applied?

• Atoms

• Neutrons

• Protons

• Electrons

This is a circuit symbol for a cell. Which line shows the positive terminal and which shows the negative terminal?

• Longer line - positive;

  Shorter line - negative

• Longer line - negative;

  Shorter line -

  positive

Out of which end of the cell do electrons flow from?

• Electrons flow from the negative terminal around to the positive terminal

• Electrons flow from the positive terminal around to the negative terminal

This picture shows another model for an electric circuit - the 'central heating model.'

What do the pipes connecting the boiler to the radiator represent?

• electrons

• bulb/other component

• cell

• wires

What does the boiler represent?

• cell/battery

• wires

• bulb/component receiving energy

• electrons

What does the radiator represent?

• Wires

• Cell

• Bulb/component

• Electrons

What does the water flowing through the pipes represent?

• Flow of electrons (current)

• Cell/Battery

• Wires

• Bulb/other component

What is a criticism of this model?

• There is nothing to model the wires in a circuit

• There is nothing to model the cell in the circuit

• There is nothing to model individual electrons/particles flowing