An electric bulb is rated at 200V - 100W. What is its resistance? Five such bulbs burn for 4 hours. What is the electric energy consumed?
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Answered by
16
power = V x I
100 = 200 x I
I = 1/2 amps
R = E/I = 100 / 0.5 = 200 ohms
4 x 100 watts = 400 watts
400 watts x 4 hours = 1600 watt-hours (energy) or 1.6 kW-hours
1.6 kW-hours x 50 paise / kW-hours = 80 paise
(assuming "unit" means kW-hour)
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Answered by
1
An electric bulb is rated at 200w-100w what is the resistance of 5 such bulbs burn for 4 hours. What is the electrical energy consumed. Calculate the cost if the rate is 50 paise per unit.
Using, P =
we get R =
=
= 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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