Hertswood Academy Gcse Physics P2 3 Current In Electrical Circuits

Front 1

1. What happens when 2 insulating materials are rubbed together? (1 mark)

Back 1

Materials become electrically charged as the electrons are rubbed off from one material and onto the other.

Front 2

2. When does a material become negatively charged? (1 mark)

Back 2

Material that gains electrons becomes negatively charged.

Front 3

3. When does a material become positively charged? (1 mark)

Back 3

Material that loses electrons become positively charged.

Front 4

4. What happens to materials which have similar charge to each other? (1 mark)

Back 4

Repel

Front 5

5. What happens to materials which are oppositely charged to each other? (1 mark)

Back 5

Attract

Front 6

6. In which material the electrical charges (electron) can move easily? (1 mark)

Back 6

Metals

Front 7

7. What is current? (1 mark)

Back 7

Flow of electric charge (electrons).

Front 8

8. What is the unit of current? (1 mark)

Back 8

Amperes or Amps (A)

Front 9

9. What is the unit of charge? (1 mark)

Back 9

Coulombs (C)

Front 10

10. What is the unit of time? (1 mark)

Back 10

Seconds (s)

Front 11

11. What is potential difference (voltage)?

(1 mark)

Back 11

Energy transferred per coulomb of charge that passes between 2 points.

Front 12

12. What is the unit of voltage (potential difference)? (1 mark)

Back 12

Volts (V)

Front 13

13. What is the unit of work done? (1 mark)

Back 13

Joules (J)

Front 14

14. Identify the circuit symbols? (1 mark each)

Back 14

?

Front 15

15. Give a use of a thermistor? (1 mark)

Back 15

Thermostats, fire alarms, laptop fan as resistance decreases as temperature increases.

Front 16

16. Give a use of LDRs? (1 mark)

Back 16

Switching lights on when it gets dark as the resistance decreases as light intensity increases (e.g. Street lights).

Front 17

17. Draw a current- voltage graph for a resistor at constant temperature? (1 mark)

Back 17

Front 18

18. How can you measure resistance of a component? (1 mark)

Back 18

Measure the current through, and the potential difference across the component. Then calculate resistance R=V÷I

Front 19

19. What is the unit of resistance? (1 mark)

Back 19

Ohms (Ω)

Front 20

20. What can affect the amount of current in circuit? (2 marks)

Back 20

Resistance in the circuit.The bigger the resistance, the smaller the current in circuit.

Front 21

21. What is the total resistance in series circuit? (1 mark)

Back 21

Total resistance is equal to sum of the resistance in the circuit. R1 + R2 = R total

Front 22

22. What happens to current in series circuit? (1 mark)

Back 22

Current stays the same everywhere in series circuit.

Front 23

23. What happens to voltage in series circuit? (1 mark)

Back 23

Voltage gets shared between the components in series circuit.

Front 24

24. What happens to current in parallel circuit? (1 mark)

Back 24

Current gets shared between the components in parallel circuit

Front 25

25. What happens to voltage in series circuit? (1 mark)

Back 25

Voltage stays the same everywhere in parallel circuit.

Front 26

26. Draw a graph for resistance of a filament bulb? (1 mark)

Back 26

Front 27

27. Draw a graph for a diode. (1 mark)

Back 27

Front 28

28. What is function of LED? (2 marks)

Back 28

LEDs emits light when a current flows through it in forward direction. They can be used in lightning instead of filament bulbs.