Question

7) State Joule's law of heating. Name the electric appliances that works on this principal.
8) What is the function of the following in the solar cooker.
a) mirror
b) glass plate​

Answer 1

Answer:

I only know 7th one

Explanation:

7)Answer. Electric iron, electric heater, electric toaster are some of the appliances that work on the principle of heating effect of current. In these appliances, Nichrome which is an alloy of nickel and chromium is used as the heating element for the following reasons. Fuse wire is an alloy of lead 37% and tin 63%.

Answer 2

Answer:

Electric iron, electric heater, electric toaster are some of the appliances that work on the principle of heating effect of current. In these appliances, Nichrome which is an alloy of nickel and chromium is used as the heating element for the following reasons. Fuse wire is an alloy of lead 37% and tin 63%.

(ii) Glass plate is used to trap the light which is reflected from surface of the mirror. Thus causing green house effect. (iii) Blackened surface is used to absorb light. Thus creating more heat inside the box.