9 A bulb is rated at 200 V and 100 W What is its resistance 5 such bulbs are - Physics - Electricity

Question

9 A bulb is rated at 200 V and 100 W What is its resistance? 5 such
bulbs are lit for 4 hours How much electrical energy is
consumed?Calculate the cost if the rate is Rs 2 40 per unit

Vijay Shankar Yadav · Accepted Answer

Dear Student,
We have P=V2R100=(200)2RR=400ohmone bulb consums 100Wthen 5 bulb will consum 500Win 4 hours these will consum 500×4=2000JNo of units in this energy=2000/1000=2And cost of  this much energy at the rate of 2
40=2×2 40=4 8 rupee
Regards

9.A bulb is rated at 200 V and 100 W.What is its resistance? 5 such bulbs are lit for 4 hours.How much electrical energy is consumed?Calculate the cost if the rate is Rs.2.40 per unit