Question

an electric lamp is marked 25W 220v it is used for 10 hrs daily. calculate its resistance while glowing and energy consumed in kwh per day

Answer 1

The electrical power and voltage is 25w and 220v respectively. Then you consider p = v^2/R. You can write this equation in another form which is R= v^2/p.

Now, you can apply the values of those variables and hence you can get 1936 ohm.

The formula of energy E is P×T which is 25/1000×10. The final answer to this question is 0.25 units.

Answer 2

Answer:

Explanation:

P = V2/R

25 = (220)2/r

r = 1936ohm m .......

25w = 25/1000kw

energy = power x time = 25/1000 x 10 =0.25kwh!!

hope ths hlps u !!