| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.HL.TZ2.23 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 23 | Adapted from | N/A |
Question
An ideal transformer has a primary coil with Np turns and a secondary coil with Ns turns. The electrical power input to the primary is P. Which of the following is the power output from the secondary?
A. \(\left( {\frac{{{N_p}}}{{{N_s}}}} \right)P\)
B. P
C. \(\left( {\frac{{{N_s}}}{{{N_p}}}} \right)P\)
D. \(\frac{1}{P}\)
Markscheme
B
Examiners report
Candidates should first read the question and look through the possible responses, consulting the data booklet only if necessary. Clearly if a transformer is ideal then the power output will equal the input.
Syllabus sections
Additional higher level (AHL) » Topic 11: Electromagnetic induction » 11.2 – Power generation and transmission
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