Question

1)Show how many would you join three resistors,each of resistance 9 ohm so that the equivalent resistance of the combination is 1)13.5 ohm 2)6 ohm
2)a)Write joules law of heating.
b) Two lamps one rated 100 W,220 V, and other 60 W, 220 V, are connected in parallel to electric mains supply.Find the current drawn by two bulbs from the line,if the supply voltage is 220 V. ​

Answer 1

1. 2 parallel then to this 1 series

2. 2 series then to this in parallel

for 5 points this much is sufficient