Sarthaks Test
+1 vote
in Physics by (59.8k points)

An electric bulb, when connected across a power supply of 220V, consumes a power of 60W. If the supply drops to 180V, what will be the power consumed? If the supply is suddenly increased to 240V, what will be the power consumed?

1 Answer

+1 vote
by (147k points)
selected by
Best answer

E = 220v

P = 60w

R = V2/P = (220 x 220)/60 = (220 x 11)/3Ω

(a) E = 180v

P = V2/R = (180 x 180 x 3)/(220 x 11) = 40.16 ≈ 40w

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.