Question

State joules law of heating , it’s mathematical expression

and name two device which works on this principle.​

Answer 1

Answer:

According to the Joule's law, when a current is passed through a conductor for a certain time, the conductor gets heated up and the amount of heat is given by : H=i2Rt. H is the heat, i is the current, R is the resistance and t is the time.

. The principle of a hydraulic machine is that a small force applied on a smaller piston is transmitted to produce a large force on the bigger piston. Hydraulic press and hydraulic brakes work on this principle

Answer 2

Explanation:

Solution. The principle of a hydraulic machine is that a small force applied on a smaller piston is transmitted to produce a large force on the bigger piston. Hydraulic press and hydraulic brakes work on this principle.