220v Outlet Wiring Diagram

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They knew there were two types of electric charge, positive (+) and negative (-), and they decided to say that electricity was a flow of positive charge from positive to negative. They knew this was a guess but a decision had to be made. Everything known at that time could also be explained if electricity was negative charge flowing the other way, from negative to positive.

Zero volts could be any point in the circuit, but to be consistent it is normally the negative terminal of the battery or power supply. You will often see circuit diagrams labelled with 0V as a reminder.

This flow of electricity is called conventional current and it is the direction of flow used throughout electronics.

1mA = 0.001A, or 1000mA = 1A