current is measured in Amperes
Voltage is the pressure at which the electricity moves
Current would be the amount of volume that is moving...
500 setting is to measure the voltage at a limit of 500 volts AC
1 Amp is enough to kill you so if you are seeing a reading at the 200 A reading and the AC
setting above 1 then unplug everything. And check to make sure you didnt make little salty snacks of all your fish...
If you have a "leak" yes you would feel it. AC
is alternating current. So depending on what you are testing to find the leak you may not use the AC
setting instead you may use the DC
Can you type on here the brand name and model # of your multimeter. Also can you tell me what type and brand and model # of your lights? Most pumps use a sealed system so no way that could cause a voltage leak. And if a heater goes and leaks your breaker will go off. Same thing with and submersible pumps they would also trip the breaker.
If your lamps are running DC
at the bulb poles then you need to use the DC
setting if they are AC
Please explain what you are testing when you get a reading on your light. the exact setting of your multimeter and exactly where you have placed your probes. This is all very key to understanding what and why you are getting a reading.
The info i gave two posts ago was assuming you were testing for DC
voltage. if you have your multimeter set on AC
200 I am hoping that is for the Voltage test of AC
with a limit of 200 Volts AC
. Not a Amperes setting.
Are you touching your light with your bare skin when you are testing for the AC
500? Because that means you are grounding the circuit through you.