DP Physics (last assessment 2024)

Question 19M.2.HL.TZ2.a

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

[Maximum mark: 2]

19M.2.HL.TZ2.a

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.

The switch S is initially open. Calculate the total power dissipated in the circuit.

[2]

Markscheme

total resistance of circuit is 8.0 «Ω» ✔

$P = \frac{{{{12}^2}}}{{8.0}} = 18$ «W» ✔

Examiners report

Most candidates scored both marks. ECF was awarded for those who didn’t calculate the new resistance correctly. Candidates showing clearly that they were attempting to calculate the new total resistance helped examiners to award ECF marks.

Syllabus sections

Core

Core » Topic 5: Electricity and magnetism » 5.3 – Electric cells

Core » Topic 5: Electricity and magnetism

Question 19M.2.HL.TZ2.a

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