Check sibling questions

NCERT Question 20 - Chapter 11 Class 9 - Work and Energy (Term 2)

Last updated at June 8, 2019 by

Slide16.JPG

Slide17.JPG

641 students have Teachoo Black. What are you waiting for?

Join Now

Transcript

NCERT Question 20 Find the energy in kWh consumed in 10 hours by four devices of power 500 W each. Power of 1 device = 500 W Power of 4 devices = 4 Γ— 500 W = 2000 W Time taken = 10 hours We know that Power = (πΈπ‘›π‘’π‘Ÿπ‘”π‘¦ π‘π‘œπ‘›π‘ π‘’π‘šπ‘’π‘‘)/(π‘‡π‘–π‘šπ‘’ π‘‘π‘Žπ‘˜π‘’π‘›) Energy consumed = Power Γ— Time taken = 2000 Γ— 10 = 20000 Wh = 20000/1000 kWh = 20 kWh Energy consumed is 20 kWh

CA Maninder Singh's photo - Expert in Practical Accounts, Taxation and Efiling

Made by

CA Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo