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This video explains the nature of zero volts and how it relates to voltage, current, and resistance. It also explains how a power supply with zero volts works, and how current can flow through a wire with no voltage.

**00:00:00**Zero volts is simply the reference point for altitude, like sea level. Analogous to voltage, there is always a difference between pressure readings depending on the location being measured.**00:05:00**This video explains how a voltmeter works, and how to read the readings. It also explains how batteries and resistors work together to create voltage, and how current works when it goes through a resistance.**00:10:00**This YouTube video explains what happens when you put a red lead in a black lead at the same voltage and zero volts. When the red lead is at zero volts, the black lead is at the same voltage.**00:15:00**This video explains how to measure voltage, and how alternating current (AC) changes the voltage polarity. With AC, the voltage is constantly flipping between positive and negative.**00:20:00**The video discusses the nature of voltage, explaining that voltage is present on both wires of a circuit, but that only one wire is visible to the viewer. It explains that an equivalent circuit can be used to show how a power supply works, and that if a resistor's impedance changes, the voltage will drop.**00:25:00**This video explains how a power supply with zero volts works. When there is a short circuit, there is no resistance between the points, so the voltage is the same at each location. This is why the power supply has zero volts when there is no load present.**00:30:00**In this video, the author explains how current can flow through a wire with no voltage (zero volts), and how this current can be greater than zero. In both cases, the voltage is the same as the current. The meter reads zero in both cases.

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