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Aluminum wire is sometimes used in place of copper wire to transmit electricity. Assuming an equal cross-sectional area, how long should an aluminum wire be for it to have the same resistance as 50 m of copper?

m


Sagot :

Answer:

An electron traveling through the wires and loads of the external circuit encounters resistance. Resistance is the hindrance to the flow of charge. For an electron, the journey from terminal to terminal is not a direct route. Rather, it is a zigzag path that results from countless collisions with fixed atoms within the conducting material. The electrons encounter resistance - a hindrance to their movement. While the electric potential difference established between the two terminals encourages the movement of charge, it is resistance that discourages it. The rate at which charge flows from terminal to terminal is the result of the combined effect of these two quantities.