DP Physics (last assessment 2024)

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Question 21M.2.HL.TZ2.a.iii

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

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.

Calculate the current in the primary of the transformer assuming that it is ideal.

[2]

Markscheme

total power required = 280 «W»
OR
uses factor 3300450
OR
total current = 18.7 « A» ✓

current = 2.5 OR 2.6 «A» ✓


Award [2] marks for a bald correct answer.

Allow ECF from (a)(ii).

 

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