| Date | November 2017 | Marks available | 1 | Reference code | 17N.1.HL.TZ0.35 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 35 | Adapted from | N/A |
Question
The ratio \(\frac{{{\text{number of primary turns}}}}{{{\text{number of secondary turns}}}}\) for a transformer is 2.5.
The primary coil of the transformer draws a current of 0.25 A from a 200 V alternating current (ac) supply. The current in the secondary coil is 0.5 A. What is the efficiency of the transformer?
A. 20 %
B. 50 %
C. 80 %
D. 100 %
Markscheme
C
Examiners report
[N/A]
Syllabus sections
Additional higher level (AHL) » Topic 11: Electromagnetic induction » 11.2 – Power generation and transmission
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