# (a) An electric bulb is rated at 200 V; 100 W. What is its resistance ? (b) Calculate the energy consumed by 3 such bulbs if they glow continuously for 10 hours for complete month of November. (c) Calculate the total cost if the rate is ` 6.50 per unit.

(a)  Potential difference , V = 200 V .

Power of bulb , P = 100 W .

We need to find the resistance of the bulb.

We know ,

Power ,

(b) Now , we need to find the electric energy consumed by 3 bulbs in 10 hours.

(c) Now, it is given that cost of one unit is 6.50 .

Therefore , total cost ,

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