Linked from
The 47 pages that link to Voltage, each with the reason it gives.
Kirchhoff's circuit lawsNarrower topic: Voltage changes are summed around loops by the second law.
ResistorNarrower topic: A resistor's terminals develop a voltage difference when current flows.
Kirchhoff's voltage lawNarrower topic: Each loop term is a voltage change between circuit points.
OscilloscopeNarrower topic: The vertical axis usually represents voltage or a scaled version of it.