A bulb is rated at 200 V and 100 W, what is the resistance? % such bulbs are lits up for 4hr. How much electrical energy is consumed? Calculate the cost if the rate 50 paisa per unit,
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the resistance is 400 ohm and the energy consumed per day is 400 joule and it cost 20 paisa per day.
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- Using, P = V²R
we get R = V²P
= (200)²100
= 400
- Energy consumed = P x t
= 100 x 4
= 400 Wh
= 0.4 kWh
- Cost at the rate of 50 paise per unit
= Rs (0.50 x 0.4)
= Rs 2
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