NCERT Solution for Class 10 Science Chapter 12
Electricity
NCERT Books for Session 2020-2021
CBSE Board and UP Board
Intext Questions
Page No-220
Questions No-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.
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Power of the electric motor is given by
P = VI
Where, V = 220 V and I = 5 A
So, Power P = 220 × 5 = 1100 W
Now, the energy consumed = Power × time
Where, P = 1100 W
t = 2 hours = 2 × 60 × 60 seconds = 7200 seconds
So, the energy consumed E = 1100 × 7200 J = 7920000 J
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Here, I = 5 A, V = 220 V, t = 2h = 7,200 s
Power, P = V I = 220 x 5 = 1100 W
Energy consumed = P x t = 1100 W x 7200 s = 7,920,000 J
Given, Electric current (I) = 5A,
Potential difference (V) = 220V,
Time (t) = 2h = 2 x 60 x 60 s = 7200 s
Power (P) =?
Energy consumed =?
We know that, P = VI = 220V × 5A = 1100W
We know that energy consumed by the electric appliance = P × t
⇒ Energy consumed = 1100 W × 7200 s = 7920000 J = 7.92 × 106 J