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An electric kettle is rated 230… (Science 2025 31/3/1 Q26)

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ScienceCBSE Class 10 · Board exam 2025, set 31/3/1 · 2 marks · Very short answer

CBSE Class 10 Science 2025: question 26

Set in the CBSE Class 10 board exam of 2025, paper 31/3/1, section B, question 26, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q26 · 2 marks · Very short answerElectricity

An electric kettle is rated 230 V; 1000 W. Calculate the resistance of its heating element when in operation.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/3/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

You know power and voltage; which form of the power formula avoids current?

Hint 2

Rearrange for R.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. Given , . Using , so .

    ½ mark

  2. 1 mark

  3. ½ mark

Answer:

Where the marks are

  • Formula (½ mark)
  • Correct substitution (1 mark)
  • Answer 52.9 Ω with unit (½ mark)

Revise the chapter

  • Chapter: Electricity (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Electricity, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/3/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.