To warm your boots on cold days, you decide to sew a circuit with some resistors

Question

To warm your boots on cold days, you decide to sew a circuit with some resistors into the insole of your boots. You want 10W of heat output from the resistors in each insole, and you want to run them from two 9-V batteries (connected in series). What total resistance should you put in each insole?

a total resistance that should you put in each insole 1/32
b total resistance that should you put in each insole 1.8
c total resistance that should you put in each insole 32
d total resistance that should you put in each insole 3240

Explanation / Answer

P = v^2/R

R = V^2 /P

R = 18 ^2 /10 = 32.4

c) total resistance that should you put in each insole 32 option C

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