Suppose you have an extension cord having a resistance of 0.085 Ω.  Part (a)  Find the potential difference, in volts, between the ends of the extension cord when a 4.4-A current flows through it.  Part (b)  A cheaper cord utilizes thinner wire and has a resistance of 0.26 Ω. What is the potential difference between its ends when a 4.4-A current flows through it?

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.