Science 7 · Unit 9: Electricity · Cambridge Lower Secondary Science Stage 7

Questions

1. 1. What is the unit of electric current?

   • amps (A)
   • volts (V)
   • newtons (N)
   • coulombs (C)
   Check

2. 2. Sofia writes "2" for the current, with no unit. What should she write?

   • 2 A
   • 2 N
   • 2 C
   • 2 V
   Check

3. 3. When electrons flow faster in a circuit, the current is ...

   • bigger
   • smaller
   • the same
   Check

4. 4. When electrons move more slowly in a circuit, what happens to the current?

   • It increases.
   • It reverses.
   • It decreases.
   • It stays the same.
   Check

5. 5. Complete the sentence. The greater the current in a circuit, the ... the flow of electrons.

   • heavier
   • faster
   • colder
   • slower
   Check

6. 6. Which instrument measures current?

   • a voltmeter
   • an ammeter
   • a thermometer
   • a newton meter
   Check

7. 7. An ammeter has a red terminal and a black terminal. Which terminal of the power supply must the red terminal connect to?

   • the positive terminal
   • either terminal
   • the negative terminal
   • neither terminal
   Check

8. 8. Do you need to show the red and black terminals on the circuit symbol for an ammeter?

   • Yes, they are drawn as + and −.
   • Yes, red must be on the left.
   • No, both ends of the ammeter are the same in a circuit diagram.
   • No, because ammeters have only one terminal.
   Check

9. 9. What does it mean when components are connected in series?

   • They are connected side by side on separate branches.
   • They are not connected at all.
   • They are all connected to the same terminal.
   • They are connected end to end, one after another, with no branches.
   Check

10. 10. How should Arun connect an ammeter to measure the current in a circuit with a cell and a lamp?

    • anywhere in series with the cell and the lamp
    • in place of the lamp
    • across the cell, not in the loop
    • outside the circuit
    Check

11. 11. Arun connects the ammeter in series between the lamp and the positive of the cell. Is this correct?

    • Yes
    • No
    Check

12. 12. Arun connects the ammeter between the lamp and the negative of the cell. Will the reading be different from between the lamp and the positive?

    • No, the current is the same everywhere in a series circuit.
    • Yes, it will be bigger near the negative.
    • Yes, it will be zero.
    Check

13. 13. Which is the WRONG way for Arun to connect his ammeter?

    • in series between the lamp and the positive of the cell
    • anywhere in series with the cell and the lamp
    • replace the lamp with the ammeter
    • in series between the lamp and the negative of the cell
    Check

14. 14. Which meter can be switched to measure current or voltage?

    • a measuring cylinder
    • a thermometer
    • a newton meter
    • a multimeter
    Check

15. 15. Sofia's multimeter is set to measure current. Which reading is most likely for a simple circuit?

    • 60 A
    • 12 A
    • 2.2 A
    • 75 A
    Check