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.

I/V curve for NDR circuit showing negative-differential-resistance region With the oscilloscope in X-Y mode, you can get an indication of the I/V curve of the device.

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.