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Page No 220: - Chapter 12 Electricity class 10 ncert solutions Science - SaraNextGen [2024]


Question 1:

What determines the rate at which energy is delivered by a current?

Answer:

The rate of consumption of electric energy in an electric appliance is called electric power. Hence, the rate at which energy is delivered by a current is the power of the appliance.

Question 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.

Answer:

Power (P) is given by the expression,

https://img-nm.mnimgs.com/img/study_content/curr/1/10/10/156/1198/Chapter%2012_html_md6cd7c3.gif

Where,

Voltage, V = 220 V

Current, I = 5 A

https://img-nm.mnimgs.com/img/study_content/curr/1/10/10/156/1198/Chapter%2012_html_mdf29993.gif

Energy consumed by the motor = Pt

Where,

Time, t = 2 = 2 × 60 × 60 = 7200 s

https://img-nm.mnimgs.com/img/study_content/curr/1/10/10/156/1198/Chapter%2012_html_4dd19828.gif  P = 1100 × 7200 = 7.92 × 106 J

Therefore, power of the motor = 1100 W

Energy consumed by the motor = 7.92 × 106 J

Also Read : Page-No-221:-Chapter-12-Electricity-class-10-ncert-solutions-Science

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