to minimize resistance, an electric wire should be ________. a wide b short c cold d all of the above
to minimize resistance, an electric wire should be ________. a wide b short c cold d all of the above
Answer
Brief Explanations:
The resistance of a wire is given by the formula $R = \rho\frac{l}{A}$, where $\rho$ is the resistivity (which depends on the material and temperature), $l$ is the length, and $A$ is the cross - sectional area. A wider wire (larger $A$) has lower resistance, a shorter wire (smaller $l$) has lower resistance. Also, for most materials, resistance decreases with decreasing temperature (colder wire has lower resistance).
Answer:
D. all of the above