Question

An electric lamp is marked 25W,220V. It is used for 10 hours daily Calculate its resistance while glowing, energy, consumed per day and cost of using it at the rate of Rs.5 for 30 days.

Answer 1

Answer:

Step-by-step explanation:

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

N = Pt÷1000W-h/unit

= 25*300÷1000

= 7.5 units

Cost = 7.5*Rs.5 per unit = Rs.37.5.

The energy consumed cost Rs.37.5.

R = V²/P

R = (220)²/25

R = 1936 ohm

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