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Question 19M.2.SL.TZ2.4bii

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.SL.TZ2.4bii
Level SL Paper 2 Time zone TZ2
Command term Deduce Question number bii Adapted from N/A
bii.
[Maximum mark: 2]
19M.2.SL.TZ2.4bii

Three identical light bulbs, X, Y and Z, each of resistance 4.0 Ω are connected to a cell of emf 12 V. The cell has negligible internal resistance.

(bii)

The switch is now closed. Deduce the ratio power dissipated in Y with S open power dissipated in Y with S closed .

 

 

[2]

Markscheme

evidence in calculation or statement that pd across Y/current in Y is the same as before ✔

so ratio is 1 ✔

Examiners report

Very few gained any credit for this at both levels. Most performed complicated calculations involving the total circuit and using 12V – they had not realised that the question refers to Y only.

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