1.

he thangle?[Ans 8 23. A parallel combination of three resistors takes a currentof 7.5 ampere from a 30 V battery. If two of the resistorshave a resistance of 10 ohm and 12 ohm, find theAns 15 ohmresistance of the third resistor.

Answer»

The resistance of the group of 3 resistors is equal to

R = 30 V / 7.5 A =4 ohm.

Let R3 be the resistance of the third resistor, then

1/R =1/10 + 1/12 + 1/R3

so,

1/4 = 1/10 + 1/12 + 1/R3

1/R3 = 1/4- 1/10 - 1/12= 15/60 - 6/60 - 5/60= 4/60

hence

R3 = 60/4 = 15 ohm

thank



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