Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
NCERT Question 16 - Chapter 12 Class 10 - Electricity
Last updated at Dec. 16, 2024 by Teachoo
NCERT Questions
NCERT Question 1 (MCQ)
Important
You are here
You are here
Class 10
Chapter 12 Class 10 - Electricity
- Concepts
-
NCERT Questions
- Questions from Inside the chapter
- Examples from NCERT Book
- Teachoo Questions
- MCQs from (Past Year Papers & NCERT Exemplar)
- Assertion Reasoning questions (MCQ)
- Case Based Questions (MCQ)
- Past Year - 1 Mark Questions
- Past Year - 2 Mark Questions
- Past Year - 3 Mark Questions
- Past Year - 5 Mark Questions
Transcript
NCERT Question 16 Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes? Power of TV = P1 = 250 W Time taken by TV = t1 = 1 hour = 60 × 60 seconds = 3600 seconds Power of toaster = P2 = 1200 W Time taken by toaster = t2 = 10 minutes = 10 × 60 seconds = 600 seconds We know that Power = 𝐸𝑛𝑒𝑟𝑔𝑦/𝑇𝑖𝑚𝑒 ∴ Energy = Power × Time TV set Energy = P1 × t1 = 250 × 3600 = 900000 J = 9 × 105 J Toaster Energy = P2 × t2 = 1200 × 600 = 720000 J = 7.2 × 105 J ∴ Energy consumed by TV is more.
