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A "bus" is a physical electrical interface where many devices share the same electric connection. This allows signals to be transferred between devices (allowing information or power to be shared). A bus often takes the form of an array of wires that terminate at a connector which allows a device to be plugged into the bus.

The "undervolt" part means that the bus that carries the current is not carrying the correct amount, it is carrying less. This was caused by an explosion of an oxygen tank that was part of the electrical generating equipment on Apollo 13. When it blew up, the voltage dropped. Like if your car battery suddenly began producing less than 12 volts.

A short circuit on Main Bus B (already explained) caused excessive current consumption. This caused the voltage to drop, possibly all the way to zero. Hence the undervolt condition.

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Q: What is a main B bus undervolt?
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