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