While you may think a wire is a wire, they come in different materials and sizes, called gauges, and those can have different ...

Modern devices probably have at least 10 times that resistance which makes the difference truly negligible. This is the basis of the four-wire, or Kelvin measurement.

The battery’s internal resistance develops a 0.5-Hz amplitude-modulated square-wave signal at the Kelvin connections attached to the battery. A synchronous demodulator comprising analog switches S 2 ...

In circuits connected in parallel, the components are connected on different branches. Find out more with BBC Bitesize. For students between the ages of 11 and 14.