Power in Circuits Video Lessons

Concept

# Problem: Find the power dissipated in each of these extension cords:(a) an extension cord having a 0.0600 - Ω resistance and through which 5.00 A is flowing; (b) a cheaper cord utilizing thinner wire and with a resistance of 0.300 Ω

###### FREE Expert Solution

The power dissipated in each extension is calculated from:

$\overline{){\mathbf{P}}{\mathbf{=}}{{\mathbf{i}}}^{{\mathbf{2}}}{\mathbf{R}}}$, where i is the current and R the resistance.

(a)

From the boxed equation above:

P = (5.00)2(0.0600)

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###### Problem Details

Find the power dissipated in each of these extension cords:(a) an extension cord having a 0.0600 - Ω resistance and through which 5.00 A is flowing; (b) a cheaper cord utilizing thinner wire and with a resistance of 0.300 Ω