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Resistance and current Suppose we have 4 pieces of very fine wire made of tungsten, 0.25 mm in diameter and each 2 meters long.
Resistance and current Suppose we have 4 pieces of very fine wire made of tungsten, 0.25 mm in diameter and each 2 meters long. That's approximately the distance between your fingertips when your arms are outstretched in both directions. Use a resistivity of tungsten 5.6 10-8 ohmm to answer these questions. 1. What is the resistance of one of the wires? 2. How would you connect two of these wires to make the largest possible resistance, and what would that be? 3. How would you connect two of these wires to make the least possible resistance, and what would that be? 4. Consider a small electric motor that carries 2 A at 12 V limited by the resistance of the wiring in its internal coils. Effectively, from Ohm's law, what resistance does the motor appear to have by itself when running? 5. Suppose that you used these wires to deliver power to this motor. When there is no resistance in the external wiring, a 12 V battery connected to this motor will deliver 2 A and 24 W of power to the motor. How much power gets to the motor, and how much is lost in the wires, if you connect the battery to the motor using two wires on each side of the motor to minimize the loss of power to heating the wires. The current flows into the motor through two and back to the battery through the other two. As always, please explain your answers well enough for us to understand your reasoning.
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