Year 4 Science Electricity and circuits: check-up and practice test questions

Method. Read the table in section 9.1.

1. Read the mains rows. Kettle, toaster, television and fan run from the mains.
   mains
2. Write the answer.
   Accept any one of: kettle, toaster, television, fan.

Check. Any one of these plugs into a wall socket. ✓

Method. Read the table in section 9.2.

1. Read the cell row. The cell pushes the electricity round the circuit.
   cell
2. Write the answer.
   cell

Check. A cell is also called a battery. ✓

Method. Read the table in section 9.2.

1. Read the switch row. The switch opens and closes the loop.
   opens and closes
2. Write the answer.
   switch

Check. A switch is used to turn the circuit on and off. ✓

Method. Read the first row of the table in section 9.3.

1. Read the row. A complete loop lights the lamp.
   lights
2. Write the answer.
   yes

Check. The lamp is in a complete loop. ✓

Method. Read the gap row in the table in section 9.3.

1. Read the row. A gap breaks the loop, so the lamp does not light.
   does not light
2. Write the answer.
   does not light

Check. The gap breaks the complete loop. ✓

Method. Read the closed switch row in section 9.3.

1. Read the row. A closed switch completes the loop, so the lamp lights.
   lights
2. Write the answer.
   yes

Check. Closed means complete. ✓

Method. Read the key idea in section 9.4.

1. Read the key idea. The cell has a long line and a short line.
   long line
2. Write the answer.
   cell

Check. The bulb symbol is a circle with a cross. ✓

Method. Think about a series circuit.

1. Think about the loop. A series circuit has all its parts in one loop.
   one loop
2. Write the answer.
   1

Check. All the parts are in one line. ✓

Method. Think about the loop.

1. Think about the wire. The loop must go all the way round, from the cell to the lamp and back.
   all the way round
2. Decide. Touching one wire is not a complete loop, so the lamp does not light.
   not complete
3. Write the answer.
   No. Accept any reason that says touching one wire does not make a complete loop.

Check. A complete loop has no gaps. ✓

Method. Think about the switch.

1. Think about opening. Opening the switch breaks the loop, so the electricity stops.
   breaks the loop
2. Write the reason. Closing it completes the loop again, so the lamp lights.
   lights
3. Write the answer.
   Accept any sentence that says a switch lets you open the loop to turn the lamp off, and close it to turn it on.

Check. A switch controls the loop. ✓

Method. Think about the appliances that use batteries.

1. Think about the list. A torch and a remote control both run from cells.
   cells
2. Write the answer.
   torch or remote control

Check. Cells are batteries. ✓

Method. Read the table of parts.

1. Read the switch row. The switch opens and closes the loop.
   opens and closes
2. Write the answer.
   switch

Check. The switch controls the loop. ✓

Method. Read the key idea in section 9.3.

1. Read the key idea. A lamp lights only in a complete loop with the cell.
   complete
2. Write the answer.
   complete

Check. A complete loop has no gaps. ✓

Method. Read the table of parts.

1. Read the cell row. The cell pushes the electricity round the circuit.
   cell
2. Write the answer.
   cell

Check. A battery is another name for a cell. ✓

Method. Read the table of parts.

1. Read the wire row. The wire carries the electricity from one part to the next.
   wire
2. Write the answer.
   wire

Check. Wires join all the parts in the loop. ✓

Method. Think about an open switch.

1. Think about the switch. An open switch breaks the loop.
   breaks the loop
2. Decide. With the loop broken, the lamp does not light.
   does not light
3. Write the answer.
   does not light

Check. An open switch means the loop is not complete. ✓

Method. Think about the appliances that plug into the wall.

1. Think of two. A kettle, a toaster, a television and a fan all plug in.
   plug in
2. Write two. Any two of these are correct.
   two
3. Write the answer.
   Accept any two of: kettle, toaster, television, fan.

Check. Mains appliances plug into a wall socket. ✓

Method. Think about the symbols.

1. Read the symbol. A circle with a cross inside is the symbol for a bulb.
   bulb
2. Write the answer.
   bulb

Check. A bulb is also called a lamp. ✓

Method. Think about the electricity.

1. Think about the flow. Electricity needs a complete loop to flow round the circuit.
   complete loop
2. Write the reason. With a gap, the electricity cannot flow, so the lamp does not light.
   does not light
3. Write the answer.
   Accept any sentence that says electricity cannot flow round a broken loop, so the lamp does not light.

Check. A gap is a break in the loop. ✓

Method. Think about a closed switch.

1. Think about the switch. A closed switch completes the loop.
   completes the loop
2. Decide. A complete loop lets the electricity flow, so the lamp lights.
   lights
3. Write the answer.
   lights

Check. The closed switch completes the loop. ✓