Physics question below ?
a boys hostel has following appliances when energy is supplied at 200 V and costs Rs 5.25 per kWh. (I) 40 bulbs of 100 W working 8 hrs a day. (2) 20 fans each drawing a current 0.8 A and working 15 HRS A DAY (3) 2 tv sets each offering a resistance of 200 ohm and working 4 hrs a day (4) 2 electric motors of 1.5 H.P. and each working 4 hrs a day .CALCULATE : (a) monthly bill (b) among the fuse of 48 A and 50 A, which one you will use and why ? ( PLS ANS URGENTLY DEAR EXPERTS , I REQUEST YOU)?
a boys hostel has following appliances when energy is supplied at 200 V and costs Rs 5.25 per kWh. (I) 40 bulbs of 100 W working 8 hrs a day. (2) 20 fans each drawing a current 0.8 A and working 15 HRS A DAY (3) 2 tv sets each offering a resistance of 200 ohm and working 4 hrs a day (4) 2 electric motors of 1.5 H.P. and each working 4 hrs a day .CALCULATE : (a) monthly bill (b) among the fuse of 48 A and 50 A, which one you will use and why ? ( PLS ANS URGENTLY DEAR EXPERTS , I REQUEST YOU)?
1 Answer
(a)
(1) 40 bulbs of 100 W working 8 hrs a day
(2) 20 fans each drawing a current 0.8 A and working 15 HRS A DAY, Using
(3) 2 tv sets each offering a resistance of 200 ohm and working 4 hrs a day, Using
(4) 2 electric motors of 1.5 H.P. and each working 4 hrs a day, Using
Monthly consumption, taking
Monthly Bill
(b)
Total load
Using the expression
We get current
We must use minimum fuse of