DP Physics (first assessment 2025)

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Question 22M.1A.SL.TZ1.21

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.SL.TZ1.21
Level SL Paper 1A Time zone TZ1
Command term Question number 21 Adapted from N/A
21.
[Maximum mark: 1]
22M.1A.SL.TZ1.21

Two cells are connected in parallel as shown below. Each cell has an emf of 5.0 V and an internal resistance of 2.0 Ω. The lamp has a resistance of 4.0 Ω. The ammeter is ideal.

What is the reading on the ammeter?

A.  1.0 A

B.  1.3 A

C.  2.0 A

D.  2.5 A

[1]

Markscheme

A

Examiners report

The correct option (A) was selected with the lowest frequency of the four possible answers. This question has a low difficulty index, suggesting that the majority of candidates found it challenging. Students were asked to apply the concept of resistors in parallel; omitting the internal resistance in parallel to the external lamp resistance was the most common error here. This question is useful for the revision of resistors in combination.

Syllabus sections