Electricity Exemplar — Class 10 Science NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 10 Science chapter "Electricity Exemplar" — 5 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 10 Science chapter "Electricity Exemplar" — 5 important questions with detailed answers for CBSE board exa…
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
NCERT Solutions for Class 10 Science — Electricity Exemplar. Step-by-step answers to all 5 textbook questions from this chapter, written for CBSE board preparation and free to use.
Electricity Exemplar — All 5 Questions Solved
Q1. Calculate current when 100 C of charge flows in 4 seconds.
Current I = Q/t = 100/4 = 25 A.
Q2. A bulb rated 60 W, 230 V is operated at rated voltage. Calculate resistance and current.
Resistance R = V^2/P = (230)^2/60 = 52900/60 ≈ 882 Ω. Current I = P/V = 60/230 ≈ 0.26 A.
Q3. Three resistors 2 Ω, 3 Ω, 6 Ω are connected in parallel. Find equivalent resistance.
1/Rp = 1/2 + 1/3 + 1/6 = 3/6 + 2/6 + 1/6 = 6/6 = 1. So Rp = 1 Ω.
Q4. A wire has resistance 10 Ω at 0°C. If temperature coefficient α = 0.005 /°C, find resistance at 50°C.
R = R0[1 + α(T - T0)]. R = 10[1 + 0.005(50 - 0)] = 10[1 + 0.25] = 10(1.25) = 12.5 Ω.
Q5. Two cells of EMF 1.5 V each are connected in series. Find total EMF and total internal resistance if each has internal resistance 0.5 Ω.
Total EMF = 1.5 + 1.5 = 3 V. Total internal resistance = 0.5 + 0.5 = 1 Ω.
How to Use These Solutions
Attempt each question yourself first and only then compare with the worked answer. Marks in the CBSE board exam are awarded for the METHOD as much as the final result, so reproduce the steps rather than memorising the last line. Where a solution states a law, a formula or a definition, learn that wording — examiners look for it.
Related practice for this chapter: chapter MCQs, previous-year questions, revision notes and sample papers.