The claim is part accurate but not good for light bulb as it is a non loaded resistive device.
A motor will try to do a certian amount of work and as the voltage lowers it will draw more amps but if the lowering voltage is due to a poor connection then the amps may be limited but this causes yet lower voltage and if the current flow is such that the motor still operates it can get damaged.
DC plants on battery do same where as battery voltage drops the regulated equipment draw more amps due to lower voltage to produce same work...power is same but inputs vary...volts lower and amps higher but watts constant.
The op likely has a bad neutral and there are cases where some electrical folks have used creative wiring where they use 2 hots at 240 and single neutral to save a wire as it meets load and code but a poor connection to the neutral in that circuit can make that circuit go wonky and let the rest be fine.
Suggest checking voltage at the fixture and if not wanting to open it up get a 2 bulb adaptor or screw in adaptor to cord which would allow measurement and testing.
After unloaded voltage measured next install large watt bulb of if cord adaptor used plug in hair dryer and measure voltage under load.
If it drops much then you may have a bad neutral which requires some trouble shooting with a voltmeter checking both hot and neutral voltage to other outlets and fixtures and the extension cord makes this easier.
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A motor will try to do a certian amount of work and as the voltage lowers it will draw more amps but if the lowering voltage is due to a poor connection then the amps may be limited but this causes yet lower voltage and if the current flow is such that the motor still operates it can get damaged.
DC plants on battery do same where as battery voltage drops the regulated equipment draw more amps due to lower voltage to produce same work...power is same but inputs vary...volts lower and amps higher but watts constant.
The op likely has a bad neutral and there are cases where some electrical folks have used creative wiring where they use 2 hots at 240 and single neutral to save a wire as it meets load and code but a poor connection to the neutral in that circuit can make that circuit go wonky and let the rest be fine.
Suggest checking voltage at the fixture and if not wanting to open it up get a 2 bulb adaptor or screw in adaptor to cord which would allow measurement and testing.
After unloaded voltage measured next install large watt bulb of if cord adaptor used plug in hair dryer and measure voltage under load.
If it drops much then you may have a bad neutral which requires some trouble shooting with a voltmeter checking both hot and neutral voltage to other outlets and fixtures and the extension cord makes this easier.
Sent from my SAMSUNG-SGH-I337Z using Tapatalk