Current and Resistance9717.67 Notethat all potential differences in this solution have a value of 120 VV∆=. First, we shall do a symbolic solution for many parts of the problem, and then enter the specified numeric values for the cases of interest. From the marked specifications on the cleaner, its internal resistance (assumed constant) is ()211where 535 WiVR∆==PP2ticRRR=+Equation (1)If each of the two conductors in the extension cord has resistance R, the total resistance in the path of the current (outside of the power source) is Equation (2)so the current which will exist is ctIV R= ∆and the power that is delivered to the cleaner is ()()2224211ittVVVVRRRR∆∆∆∆====
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