c. Describe the advantage using a.
24. Why the metal core the transformer
laminated? How cool big power transformer?
28. 400V
c. around simple bar magnet
b.
23. 230V
b.c.
21.
30. Sketch simple circuit show how voltmeter and ammeter would be
connected into the circuit measure total voltage and total current. 132kV. List five materials which are used good insulators the
electrotechnical industry. explain the action and state one application for solenoid. Describe with the aid simple diagram how the atoms and electrons
behave material said good conductor electricity. List five practical applications for transformer for example, shaver
socket.121
U W
6 6
2 2
C1
L1 C1
2
C3
4
5
6
To phase supply
To phase motor
18. Describe the three effects electric current. Electricity distributed the National Grid at:
a.
26. Sketch the magnetic flux patterns:
a. List five materials which are used good conductors the
electrotechnical industry. horseshoe magnet
c. Describe, with the aid simple diagram, how the atoms and
electrons behave material said good insulator. supply.
25.
.
22. Sketch simple circuit two resistors connected series across a
battery and explain how the current flows this circuit.
20. Sketch the construction simple transformer and label the primary
and secondary windings.
19.
27. 25kV
d.
29. supply for the National Grid
rather than d. Sketch simple circuit two resistors connected parallel across a
battery and explain how the current flows this circuit
