Electricity

Questions

1. What must a circuit have for current to keep flowing?

   • A complete closed loop
   • A single open gap
   • Only a switch
   • Two separate wires
   Show answer

   A complete closed loop

2. What does a switch do in a circuit?

   • Lowers the voltage
   • Makes more electrons
   • Opens or closes the circuit
   • Stores the current
   Show answer

   Opens or closes the circuit

3. A bulb will stay lit if there is a break in the circuit. (True or false?)

   Show answer

   False

4. Which material is a good electrical insulator?

   • Aluminium
   • Copper
   • Iron
   • Rubber
   Show answer

   Rubber

5. Why are electrical wires usually made of copper?

   • It conducts electricity well
   • It is a good insulator
   • It is very light
   • It never gets warm
   Show answer

   It conducts electricity well

6. Name one common material that is a conductor of electricity. (Answer out loud)

   Show answer

   Any metal, e.g. copper, iron or silver

7. In a series circuit with one bulb removed, what happens to the others?

   • They flicker
   • They get brighter
   • They go out
   • They stay the same
   Show answer

   They go out

8. Why are household lights wired in parallel?

   • Each works independently
   • They need higher current
   • They only need one wire
   • They use less energy
   Show answer

   Each works independently

9. In a parallel circuit, there is more than one path for the current. (True or false?)

   Show answer

   True

10. In which unit is electric current measured?

    • Amperes
    • Ohms
    • Volts
    • Watts
    Show answer

    Amperes

11. Which device is used to measure voltage?

    • Ammeter
    • Barometer
    • Thermometer
    • Voltmeter
    Show answer

    Voltmeter

12. A 12 V battery drives 3 A through a resistor. What is its resistance in ohms? (Answer out loud)

    Show answer

    4 ohms

13. Two identical 3 V cells are connected in series. What is the total voltage?

    • 1.5 V
    • 3 V
    • 6 V
    • 9 V
    Show answer

    6 V

14. Three 2 ohm resistors are in series. What is the total resistance?

    • 0.67 ohms
    • 2 ohms
    • 3 ohms
    • 6 ohms
    Show answer

    6 ohms

15. Two identical 4 ohm resistors are connected in parallel. What is the total resistance? (Answer out loud)

    Show answer

    2 ohms

16. Voltage is the push that drives current around a circuit. (True or false?)

    Show answer

    True

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