You want to make a 40 ΩΩ resistor from a poorly conducting material that has a resistivity 0.020 Ω m. The resistor will be a cylinder with a length of 5 times its diameter. Current will flow lengthwise through the resistor. What should be its length in cm?

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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.