ACTIVITY 5
1. (a)
State three factors that affect the efficiency of a transformer
(b) A transformer with
100 turns in its secondary coil supplies 8.0 V to a light in a toy. The primary
circuit in connected to 240 V main supply. What is the number of turns in the
primary coil?
2. Explain why the core of a transformer is;
a)
Laminated
b)
Made
from a soft magnetic material such as iron
3. Abuu Talhah builds a transformer,
connected to a 12 V a.c power supply. He has 200 turns on the primary and 40
turns on the secondary. What is the output voltage?
4. (a) Briefly explain four ways contributes
to the power losses in transformers
(b) Briefly explain how
to minimize power losses in transformers as explained in (a)
Above
5. (a) with the aid of diagrams tabulate
three differences between step-down and step-up
transformers
(b)
A
step-up transformer connected to 20 V source delivers energy at 250 V. if the
efficiency of the transformer is 95%, determine the current in the primary
circuit when the output terminals are connected to a lamp rated 250 V, 100 W.
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