NCERT - Science

Book: NCERT - Science

Chapter: 12. Electricity

Subject: Physics - Class 10th

Q. No. 3 of In Text Questions-Pg-218

Listen NCERT Audio Books - Kitabein Ab Bolengi

3

An electric iron of resistance20 takes a current of 5 A. Calculate the heat developed in 30 s.

Here, Current, I = 5 A

Resistance, R = 20


Time, t = 30 s


Now, we know, Heat produced is given as,



Thus, the heat developed is 15000 joules.


3

Chapter Exercises

In Text Questions-Pg-200
In Text Questions-Pg-202
In Text Questions-Pg-209
In Text Questions-Pg-213
In Text Questions-Pg-216
In Text Questions-Pg-218
Exercise-Pg-221

More Exercise Questions

1

Why does the cord of an electric heater not glow while the heating element does?
2

Compute the heat generated while transferring 96000 coulombs of charge in one hour through a potential difference of 50 V.
3

An electric iron of resistance20 takes a current of 5 A. Calculate the heat developed in 30 s.
1

What determines the rate at which energy is delivered by a current?
2

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