Q.16:- Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
For T.V set
Power (P) = 250w, Time (t) = 1hr=60×60=3600s
Power (P) = 1200w, Time (t) = 10min=10×60=600s
We know that Energy (E) = P×t
∴ Energy consumed by a TV set = 250 × 3600 = 9 × 105J
∴ Energy consumed by a toaster = 1200 × 600 = 7.2× 105J
∴ the energy consumed by a 250 W TV set in 1 h is more than the energy
consumed by a toaster of power 1200 W in 10 minutes.
TutionTeacher: Know free answers of your school textbook. You can find the correct answer of your School textbook question here. This education portal will help in getting the NCERT solutions for your exams. Here you will get the complete question answer and solution of your textbook for your better education. Your can also ask for online study and assignment help from menu. Online test series will also help you how to learn and achive better marks in your school or collage.