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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, 19:15: PM
answered-by-expert 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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