Question

In the following circuits (Figure 12.2), heat produced in the resistor or combination of resistors connected to a 12 V battery will be:

• A. same in all cases
• B. maximum in case (iii)
• C. maximum in case (ii)
• D. minimum in case (i)

Answer 1

Answer: (B)

. maximum in case (iii).

We know, $H=I^{2}Rt$ -----> using heating effect formula

$case\left(1\right)H=\left(36\right)\left(2\right)=72units$

$case\left(2\right)H=\left(9\right)\left(4\right)=36units$

$case\left(3\right)H=\left(144\right)\left(1\right)=144units$

case(3)>case(1)>case(2)