Question

28. Show that'electric power is given by V2/R. What is the SI unit of electric power?

29. What is meant by heating effect of current? Derive an expression for it. Name two application of the heating
effect of current?​

Answer 1

Answer:

SI unit is watt.of electric power

Explanation:

we know:

P=W/t. =QV/t

P=VIt/t =VI

By ohm,s law I =V/R So:

P=V^2/R after putting the value.

29 expression for the heat effect current is :

H= I^2Rt this come in joule

to convert into calorie multiply 0.24

application of heating effect current are :

i the electric appliance should have high melting point to retain the heat from current

ii electric fuse should be used to protect the appliance from high voltage .

thank you Hope this will helpful.

Answer 2

Answer:

the above answer is correct:)

Explanation:

hv a gud day ahead:)