Question

A student boils the water in an electric kettle for 20 minutes after being s switched on using the same mains supply he wants to reduce the boiling time of water to do so should he increase or decrease the length of the heating element? Justify

Answer 1

Answer:

increase

Explanation:

heat = H = (V^2)t/R

now....to reduce the time we need to reduce the R also.

but R is directly proportional to it's Length. hence he has to increase the length