Circuitmess Wacky Robot Bob Instructions Manual page 11

Ohm's law is the law according to which the strength
of electric current in an electrical conductor at a
constant temperature is determined as the ratio
of electric voltage and electric resistance.
= I
Ohm's law applies to metals and conductive solutions, and
we refer to them as Ohmic conductors. Materials for which
this law does not apply are called non-Ohmic conductors.
U
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Georg Simon Ohm