Question

An electric lamp is marked 25w, 220v it is used for 10 hours daily calculate its resistance while glowing energy consumed in kwh per day

Answer 1

Answer:

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