• Electricity and Circuits
• Energy
• Force and pressure
• Magnets and magnetism
• Mass, weight, volume and density
• Sound and light
• Speed, distance, time and temperature
• Springs and moments
• The Earth in Space
• Measurement and Units

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### Electricity and Circuits

1. What is the unit for electrical current?

2. In which of the circuits shown will the bulb (or bulbs) be the brightest?

3. In which of the circuits shown will the bulb (or bulbs) be the dimmest?

4. Which of the circuit diagrams shows two bulbs joined in parallel?

5. Which of the circuit diagrams shows two bulbs joined in series?

6. The circuit shows two bulbs and an open switch.
Both bulbs are on.

What will happen if the switch is closed?

7. The circuit shows two bulbs and a switch.
Both bulbs are on.

Is the switch OPEN or CLOSED?

8.

Which of the lamps in the diagram will be on?

9. Look at the circuit diagram which shows 2 batteries connected to three bulbs.
What would happen if we added an extra battery?

10. If I unscrewed bulb B from its holder what would happen to the other bulbs?

11. Look at the circuit diagram and say which of these statements is true.

12. Which of these substances conduct electricity?

13. The diagram shows a circuit containing two similar bulbs and a battery.

Which bulb will be brightest?

14. The diagram shows a circuit containing two similar bulbs and a battery.

If Bulb B is unscrewed what will happen to bulb A?

15. What happens to the current through a component if the voltage is increased?

16. Name an instrument for measuring the current in a circuit

17. Which of these substances will allow electricity to go through it?

18. When talking about electricity, what do the letters AC stand for?

19. Which of the following is NOT a metal but DOES conduct electricity?

20. Which of the circuit diagrams shows two bulbs joined in parallel?

21. The circuit below shows 3 lamps (P, Q and R) and 4 ammeters (A1, A2, A3 and A4)
The lamps are all similar to each other.

Will the reading of A4 be more than 0.3A, less than 0.3Aequal to 0.3A or zero amps?

22. The circuit below shows 3 lamps (P, Q and R) and 4 ammeters (A1, A2, A3 and A4)
The lamps are all similar to each other.

23. The circuit diagram shows 4 components represented by circuit symbols

Which of the symbols represents a light dependent resistor?

24. The circuit diagram shows 4 components

What changes would you notice to this circuit if you placed your hand over component B making it darker?   (Tick all that apply)

25. What is the name of this component?

26. What kind of circuit is this?

27. What component does this electrical symbol represent?

28. What is the name of the component marked X and would the bulb be on or off?