Arun buys for bulbs of 15 Watts 40 watt 60 Watts 100 Watts representatives which one should be used in his room at a light bulb?why. give me the right answer.
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Explanation:
Maximum power of the circuit = (40 x 15) + (100 x 5) + (80 x 5) + (1000 x 1)
= 600 + 500 + 400 + 1000
= 2500 W = 2.5 kW.
(ii) Maximum current capacity = Total wattage/Voltage of mains = 2500/220 = 11.36 (or 11.4) A.
(iii) Electrical energy consumed in a week
In 40 W bulbs = (40 x 15) x (4 x 7)/1000 = 16.8 kWh
In 100W bulbs = (100 x 5) x (4 x 7)/1000 = 14 kWh
In 80 W fans = (80 x 5) x (10 x 7)/1000 = 28 kWh
In 1 kW heater = (1000 x 1) x (2 x 7)/1000 = 14 kWh
∴ Total electrical energy consumed = 16.8 + 14 + 28 + 14 = 72.8 kWh.
(iv) Cost of electricity = 72.8 x 1.25 = 91 Rs
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