1. Higher Electricity

2. What is the definition of electrical current?
QUESTION 1
What is the definition of electrical current?

3. What is the definition of potential difference?
QUESTION 2
What is the definition of potential difference?

4. What is the definition of electrical power?
QUESTION 3
What is the definition of electrical power?

5. Calculate the resistance between X and Y.
QUESTION 4
Calculate the resistance between X and Y.

6. QUESTION 5
When the switch closes, what happens to the readings on the ammeter and the voltmeter?

7. Calculate the resistance between X and Y.
QUESTION 6
Calculate the resistance between X and Y.

8. What is the purpose of Wheatstone Bridge Circuits?
QUESTION 7
What is the purpose of Wheatstone Bridge Circuits?

9. QUESTION 8
State two things about a Wheatstone Bridge Circuit which will indicate that it is balanced.

10. When Rv is increased from 10kΩ, what will the graph look like of
QUESTION 9
When Rv is increased from 10kΩ, what will the graph look like of
V against ΔR?

11. QUESTION 10
Calculate the reading on the voltmeter in the unbalanced Wheatstone Bridge circuit shown below.

12. State the definition of EMF.
QUESTION 11
State the definition of EMF.

13. What is meant by a terminal potential difference of 5V?
QUESTION 12
What is meant by a terminal potential difference of 5V?

14. State the three variations of the EMF equation.
QUESTION 13
State the three variations of the EMF equation.

15. QUESTION 14
Which two pieces of information can be taken from the graph below when it cuts the y-axis and the x-axis?

16. Find the internal resistance of the battery from the graph below.
QUESTION 15
Find the internal resistance of the battery from the graph below.

17. QUESTION 16
Calculate the reading on the ammeter, when the switch is open and when the switch is closed.

18. What is meant by the term ‘short circuit current’?
QUESTION 17
What is meant by the term ‘short circuit current’?

19. QUESTION 18
Under what conditions do you have maximum power transfer in a circuit from a battery with an internal resistance r?

20. State the mains voltage and mains frequency of the supply in the UK.
QUESTION 19
State the mains voltage and mains frequency of the supply in the UK.

21. QUESTION 20
State the names of the controls on an oscilloscope used to measure
a)Peak Voltage b)Frequency.

22. QUESTION 21
If the oscilloscope is set at 5V/div, then calculate the peak voltage and the rms voltage from the wave trace below.

23. QUESTION 22
If the oscilloscope is set at 10ms/div, then calculate the frequency of the wave trace below.

24. QUESTION 23
State two observations of the wave trace below if the oscilloscope setting is changed from 5ms/div to 20ms/div.

25. QUESTION 24
A peak current of 0.37A flows through a lamp of resistance 885 Ω.
Calculate the power of the lamp.

26. QUESTION 25
Calculate the peak voltage and the peak current from the circuit below.

27. QUESTION 26
What do capacitors store and what type of circuits would you find them in?

28. QUESTION 27
State the unit for Capacitance and give another unit which is equivalent to it.

29. State what is meant by a capacitor having a capacitance of 3000µF.
QUESTION 28
State what is meant by a capacitor having a capacitance of 3000µF.

30. QUESTION 29 A capacitor is marked 6V,120µF.
Calculate the maximum charge and the maximum energy that it can store.

31. QUESTION 30
If the capacitance and resistance are both increased in the diagram below, then sketch the new waveform produced.

32. QUESTION 31
Calculate the energy stored in the capacitor below, when the voltage across it is 8V.

33. QUESTION 32

34. QUESTION 33
What will happen to the readings on each ammeter when the frequency of both supplies are increased?

35. QUESTION 34
Name the process involved when impurity atoms are added to form a
p-type or an n-type semiconductor material.

36. QUESTION 35 Name the two types of bias that a
p-n material can be connected up in with a battery.

37. State the charge present in p-type and
QUESTION 36
State the charge present in p-type and
n-type semiconductor materials and what type of charge carriers do they both prefer?

38. QUESTION 37
Name component X, state the mode it is operating in and describe how it will turn the electric motor.

39. QUESTION 38
What difference is noticeable between the conduction and valence bands in semiconductors and insulators when comparing them?

40. QUESTION 39
What happens to the band gap in a semiconductor material when the temperature increases?

41. Explain using Band Theory how LED’s emit photons of light.
QUESTION 40
Explain using Band Theory how LED’s emit photons of light.

42. The End