Question

When the starter motor on a car is engaged, there is a 250 A current in the wires between the battery and the motor. Suppose the wires are made of copper and have a total length of 1.2 m. What is the resistance of the wires?

Answer 1

To calculate the resistance of the wires, use Ohm's Law which states that resistance is equal to voltage divided by current. Convert the current to milliamperes and plug in the values to the formula.

Step-by-step explanation:

The resistance of the wire can be calculated using Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the current flowing through the wires is 250 A and the length of the wires is 1.2 m.

Using the formula, R = V/I, we can calculate the resistance. However, we need to convert the current from amperes to milliamperes (mA) for the formula, as the SI unit for resistance is ohms (Ω) and the conversion factor is 1 A = 1000 mA.

R = V/I = 0.250 V / (250 A * 1000 mA/A) = 0.001 Ω