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Question 21M.2.HL.TZ2.7a.iv

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Date May 2021 Marks available [Maximum mark: 2] Reference code 21M.2.HL.TZ2.7a.iv
Level HL Paper 2 Time zone TZ2
Command term Explain Question number a.iv Adapted from N/A
a.iv.
[Maximum mark: 2]
21M.2.HL.TZ2.7a.iv

The primary coil of a transformer is connected to a 110 V alternating current (ac) supply. The secondary coil of the transformer is connected to a 15 V garden lighting system that consists of 8 lamps connected in parallel. Each lamp is rated at 35 W when working at its normal brightness. Root mean square (rms) values are used throughout this question.

(a.iv)

Flux leakage is one reason why a transformer may not be ideal. Explain the effect of flux leakage on the transformer.

[2]

Markscheme

the secondary coil does not enclose all flux «lines from core» ✓

induced emf in secondary
OR
power transferred to the secondary
OR
efficiency is less than expected ✓


Award [0] for references to eddy currents/heating of the core as the reason.

Award MP2 if no reason stated.

 

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