) An electric bulb is marked 200 V, 100 W. i. What do the markings mean? ii. Another bulb is marked 200 V, 50 W. Which of the two has a coil of higher resistance? iii. What will be the energy used by the first bulb if it is used for 10 hours a day for 10 days? iv. What is the cost of the energy used if 1 kWh is priced at Rs 1.60?
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sorry I didn't take the pic of this answer
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Rating of bulb is given as 220 V,100W i.e Vb=200 V and Pb=100 W
Thus resistance of bulb R=PbVb2=100(200)2=400 Ω
Equivalent resistance of 5 bulbs connected in series Rs=5R=5×400=2000Ω
Supply voltage Vs=200 V
So, current in the circuit I=RsVs=2000200=0.1 A
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