In a circuit, which particle flows from the negative terminal to the positive terminal?
1 steps up or steps down voltage.
2 turns generators into motors.
3 transforms magnetic field lines.
Voltage can be induced in a wire by:
1 moving the wire near a magnet.
2 moving a magnet near the wire.
3 changing the current in a nearby wire.
4 all of these.
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For historical reasons, "conventional" current flows from positive to negative. This is simply used for analyzing circuits. It was years later after the discover of the electron and in understanding the chemical electromotive forces involved in a battery that creates an electric field in the wire that we now understand why electrons flow from the negative terminal to the positive.
Okay, thanks I was thinking it was electrons but was not sure.
A transformer is a loop of wire, most of the time wound around an iron core, that focuses the magnetic field within a confined area. This magnetic field is induced by the current flowing through the wire. If you wind another wire around the same core, the magnetic field in the core will induce current in this second wire. The ratio of the number of turns of the first to the second determine how much current is amplified or stepped down. The affect is similar for voltage. If you step up voltage, current is stepped down and vice versa -- all determined by the turns ratio.
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Okay, and for the last one I was thinking it was the last one am I correct?
The bottom line is that if you have a closed loop of wire in the vicinity of a \(changing\) magnetic field, current will be induced in this close-loop wire.
The answer will be "induced" by truly understanding the previous sentence.