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In the given circuit… (Class 10 Science 2024, Q25B)

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ScienceCBSE Class 10 · Board exam 2024, set 31/1/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 25(B)

Set in the CBSE Class 10 board exam of 2024, paper 31/1/1, section B, question 25(B), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q25(B) · 2 marks · Very short answerElectricity

In the given circuit calculate the power consumed in watts in the resistor of .

Figure in the paper: Circuit: a rectangular loop containing two resistors in series along the top side, labelled 1 Ω (left) and 2 Ω (right). The bottom side contains a 6 V battery (cell symbols with + terminal on the left). See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/1/1.

Hints

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

Hint 1

First find the total resistance of the series circuit and then the current.

Hint 2

In series the current is the same everywhere; use for the 2 Ω resistor.

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. The resistors are in series: .

    ½ mark

  2. Current: A. The same current flows through both resistors.

    ½ mark

  3. Power in the resistor: .

    ½ mark

  4. W

    ½ mark

Answer: 8 W

Where the marks are

  • Equivalent resistance 3 Ω (½ mark)
  • Current 2 A (½ mark)
  • Uses (½ mark)
  • P = 8 W (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 paper2024 board paper, set 31/1/1: 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.