Chapter 11

NCERT
Class 10
Science
Solutions
2. An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

Question:

An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

Answer:

Here, I = 5 A, V = 220 V, t = 2 h = 2 × 3600s

From the formula,

P = VI

   = 5 × 220

   = 1100 W

Heat = Power × time

         = 1100 × 2 × 3600

         = 7920000 J

         = 7.92 × 103 KJ

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