CBSE Class 10 Answered
A 240 V ac mains circuit to which a number of appliances are connected & switched on.
240 ac-Fan(1.2KW)-Refrigerator(200 watt)-two bulbs(60w each,parallely)
1. Calculate the power supplied to the circuit.
2.calculate
a) The current in the refrigerator.
b) The energy used by the fan in 3 hours
c)The resistance of filament of one bulb.
Asked by agraharianiruddha | 26 Jul, 2018, 07:15: PM
Expert Answer
1. Power used by Fan = 1200 W
Power used by Refrigerator = 200 W
Power used by two bulbs = 120 W
Total Power = 1520 W
2. (a) current in refrigerator = 200/240 = 5/6 A = 0.833 A
2. (b) Energy used by fan in 3 hours = 1.2 kW×3 hr= 3.6 kW-hr
= 1200×3×60×60 = 12.96 MJ
2. (c) Resistance of filament P = V2/R or R = V2 / P = 240×240 / 60 = 960 Ω
Answered by Thiyagarajan K | 27 Jul, 2018, 11:14: AM
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