Final answer:
The measurement of the resistance of the variable resistor obtained in part 7 is a valid approximation of the resistance of the flashlight when it has current passing through.
Step-by-step explanation:
In order to obtain a valid approximation of the resistance of the flashlight when it has current passing through, we can use a variable resistor. The measurement of the resistance of the variable resistor obtained in part 7 is a valid approximation of the resistance of the flashlight because the variable resistor can be adjusted to have a similar resistance value as the flashlight. By adjusting the variable resistor to match the resistance of the flashlight, we can measure the current passing through the variable resistor, which is the same current that would pass through the flashlight. Therefore, the measurement of the resistance of the variable resistor provides a valid approximation of the resistance of the flashlight when it has current passing through.