I know when you measure voltage across a switch, in an ac circuit, if the voltmeter reads 0 volts the switch is closed, if the meter reads 120 volts the switch is open. If you measure voltage across a load such as a fan or resistor does the same rule apply. Or because of the load resistance will the meter read different. Let's say the fan is working and you measure voltage across the fan from line to neutral should the meter read 120 volts or 0 volts. And vice a versa if the fan is not working should you read 120 volts if there is line voltage across the fan. Maybe the fan has an open winding what should you read on the meter.