Page 92 - Physics_Form_4
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Electromagnetism
current flowing in the resistor is the secondary coil between
0.4 A, and when the same resistor is terminals B and C.
connected between terminals B and (d) The p.d between the terminals
C, the current is 1.2 A. Assuming A and C.
the transformer is 100% efficient,
FOR ONLINE READING ONLY
calculate: (e) The current which would flow in
(a) The p.d between terminals A the 6.0 Ω resistor when connected
and B. between terminal A and C.
(b) The p.d between terminals B 20. Transformers are usually coupled
and C. with cooling systems to prevent them
from overheating. Explain how heat
(c) The number of turns on is generated in a transformer.
85
Physics Form 4.indd 85 14/07/2025 14:43
