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Voltage drop
Voltage drop is the loss of voltage as electricity travels through a wire, usually worse on long runs or undersized wire.
Why it matters
Too much voltage drop can cause dim lights, weak motor performance, and equipment that fails early.
Where people get this wrong
Voltage drop can happen even when the breaker never trips. A problem can show up only when a heavy load starts, like a vacuum or a garage tool.
Real-world example
You start a table saw in the garage and the lights dip every time. That can be voltage drop telling you the run is long or the wire is too small.
Where this hits your build
This matters during rough-in and before drywall. Once walls close, adding or moving wiring becomes expensive. Plan ahead.
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