NCERT - Science

Book: NCERT - Science

Chapter: 12. Electricity

Subject: Physics - Class 10th

Q. No. 4 of In Text Questions-Pg-209

Listen NCERT Audio Books - Kitabein Ab Bolengi

4

Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal ?

The coils (or heating elements) of toasters and electric irons are made of an alloy rather than a pure metal due to the following two reasons:

1) The resistivity of an alloy is much higher than that of a pure metal, and


2) An alloy does not undergo oxidation easily even at high temperature


4

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

On what factors does the resistance of a conductor depend?
2

Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?
3

Let the resistance of an electrical component remain constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?
4

Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal ?
5

Use the data in Table on page 23 of this book to answer the following:

(a) Which among iron and mercury is a better conduction?


(b) Which material is the best conductor?