Science 6 · Unit 5: Forces and electricity · Cambridge Primary Science Stage 6

Questions

1. 1. Why do we use circuit diagrams?

   • They are quick to draw and everyone understands the symbols.
   • They look prettier.
   • They show real colours.
   • They make circuits work better.
   Check

2. 2. What does a circuit diagram use instead of pictures of the components?

   • colours only
   • conventional symbols
   • photographs
   • written sentences
   Check

3. 3. What is voltage?

   • the length of a wire
   • the brightness of a lamp
   • the strength of electricity a component needs, measured in volts
   • the mass of a battery
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4. 4. How can you make a 3 V battery?

   • join two 1.5 V cells
   • use one 1.5 V cell
   • join three lamps
   • use a longer wire
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5. 5. Why might a buzzer not work with one 1.5 V cell?

   • Buzzers don't need electricity.
   • It needs a stronger supply of electricity, such as 3 V.
   • Buzzers only work in parallel.
   • The cell is too strong.
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6. 6. What is a series circuit?

   • a circuit with no battery
   • a circuit with a gap
   • a circuit with only one path for the current
   • a circuit where each lamp has its own path
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7. 7. What is a parallel circuit?

   • a circuit with no lamps
   • a broken circuit
   • a circuit with only one path
   • a circuit where each lamp has its own path to the battery
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8. 8. One lamp in a series string of festival lights fails. What happens?

   • Only that lamp goes out.
   • All the lamps go out.
   • Nothing happens.
   • The others get brighter.
   Check

9. 9. One lamp is unscrewed from a parallel circuit. What happens to the other lamp?

   • It gets brighter.
   • It goes out.
   • It gets dimmer.
   • It stays lit with the same brightness.
   Check

10. 10. Two lamps, one battery. Where are the lamps brighter?

    • in a series circuit
    • in a parallel circuit
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11. 11. Why must you not unscrew a lamp that has been on for a while?

    • It will explode.
    • It will be hot and could burn your fingers.
    • It will get magnetic.
    • It will freeze.
    Check

12. 12. How could you make a lamp in a series circuit shine brighter?

    • add another lamp
    • add another cell
    • open the switch
    • use a longer wire
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13. 13. Look at the circuit diagram. The switch is open. Will the lamp light?

    • Yes, brightly.
    • No, the circuit is not complete.
    • Yes, dimly.
    • Only in parallel.
    Check

14. 14. Two buzzers in series don't work. What could Sofia add to make them work?

    • a longer wire
    • an open switch
    • another buzzer
    • another cell, to increase the voltage
    Check

15. 15. Without adding components, how could Sofia make the two buzzers work?

    • connect them in parallel
    • remove the battery
    • open the switch
    • connect them in series
    Check

16. 16. Who invented one of the first batteries, the voltaic pile, in 1800?

    • Isaac Newton
    • Alessandro Volta
    • Thomas Edison
    • Archimedes
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17. 17. What is an advantage of rechargeable batteries?

    • They are always cheaper at first.
    • They are bigger.
    • They can be used again instead of thrown away.
    • They never run out.
    Check