What is a power rail?

What is a power rail? A power supply rail is a supply voltage that is provides power for electrical or electronic devices or components on a circuit board. Power supply rails used for early desktop computers included +/–5 volts (V) as direct current (DC), +/– 12 volts direct current (VDC), and a common or return line.

A power supply rail is a supply voltage that is provides power for electrical or electronic devices or components on a circuit board. Power supply rails used for early desktop computers included +/–5 volts (V) as direct current (DC), +/– 12 volts direct current (VDC), and a common or return line.