Question

List applications of heating effect from daily life.
11. (a) What is meant by saying that the potential difference between two points is 1 volt? Name a device that helps
to measure the potential difference across a conductor.
(b) Why does the connecting cord of an electric heater not glow while the heating element does
(c) () Among silver and copper, which one is a better conductor, and why?
(ii) What material is used in making the filament of an electric bulb, and why?
2011​

Answer 1

Answer:

11.a The potential difference can be seen as that consider 1st tube containing water to a certain height say 1m and the 2nd has let's say .5m so the potential difference between these two tubes is .5m .

The device used for measuring the p.d 8s known as Voltmeter.

b.) It's all because of the resistance.

c.) Silver has more conductivity

ii.) Tungsten

Explanation:

b.) The Resistance of the cord is very very less when compared to the heating element . And as we know that

H=I^2*R

More the resistance more the heat generation.

c.) it's because of more free electrons in silver than in the copper.

ii.) because it has one of the highest melting point among all the elements