Originally Posted by padcarroll
Excuse my ignorance but why is the disconnect on the negative side? My class A disconnects are on the positive terminal.
Actual current flow is he reason. Although the negative charged electrons move through the wire toward the positive (+) terminal of the source of electricity, the current is indicated on wiring diagrams as going from positive to negative. This is an unfortunate and confusing convention.
Ben Franklin originally named charges positive (+) and negative (−) when he was studying static
electricity. Later, when scientists were experimenting with electrical currents, they said that electricity travels from (+) to (−), and that became the convention.
This was before electrons were discovered. In reality
, the negative charged electrons move toward the positive, which is the opposite direction that people show current moving. It is confusing, but once a convention is made, it is difficult to correct it. Therefore, disconnecting the negative terminal stops all electron flow making short circuits impossible.