Single phase power
What is Single phase power?
A form of AC, where all electrons move back and forth simultaneously. In most countries, for example in Australia, AC reverses 50 times per second. If all electrons switch direction of their move at the same time, it leads to zero power at the point of direction change. In three-phase power, electrons move through three wires and the time of their move switch is a bit shifted, so the power supply is constant.