Physics Asked on February 14, 2021
I always thought it’s because, if we consider a circuit ABCDE with only a battery and an ammeter, if we connect the negative terminal to the positive terminal the sum of the voltages across loops ABCDE would not be zero. Is that the actual reason, or is it because of something else?
It is just a labelling convention which will give you a positive reading on the ammeter if a current enters the ammeter at the red terminal and a negative reading if the current leaves the ammeter from the red terminal. With moving coil meters a current entering the positive terminal will deflect the needle/spot of light to the right.
Answered by Farcher on February 14, 2021
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