19. 25kV
d. Sketch the construction simple transformer and label the primary
and secondary windings. Sketch simple circuit show how voltmeter and ammeter would be
connected into the circuit measure total voltage and total current.
20. List five materials which are used good insulators the
electrotechnical industry. around simple bar magnet
b. Describe the three effects electric current. supply.
24. List five practical applications for transformer for example, shaver
socket. List five materials which are used good conductors the
electrotechnical industry.
30.c. supply for the National Grid
rather than d. Describe, with the aid simple diagram, how the atoms and
electrons behave material said good insulator. Describe the advantage using a. 230V
b. Why the metal core the transformer
laminated? How cool big power transformer?
28. explain the action and state one application for solenoid. Electricity distributed the National Grid at:
a.
27. Describe with the aid simple diagram how the atoms and electrons
behave material said good conductor electricity. Sketch simple circuit two resistors connected series across a
battery and explain how the current flows this circuit.
23. Sketch simple circuit two resistors connected parallel across a
battery and explain how the current flows this circuit.
29.
25.
. horseshoe magnet
c. 400V
c. Sketch the magnetic flux patterns:
a. 132kV.c.
22.
26.121
U W
6 6
2 2
C1
L1 C1
2
C3
4
5
6
To phase supply
To phase motor
18.
21
