Electronics/Resistance

The electrical resistance of an object is a measure of its opposition to the flow of electric current. The reciprocal/opposite electrical property is Conductance. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω), named after Georg Simon Ohm.

There is a material science behind what makes a good electrical conductor (things like aluminum and copper, which are good at transmitting electricity), and resistors (things like rubber, wood and plastics, which do not like to transmit electricity). There are items like heating elements and items like Electronics/Resistors that have a fixed resistance value. Resistance is used to ensure the current and voltage after the item causing the resistance is at a specified value. If the resistor is the only path of electrical current flow (series circuit), there will be a voltage drop after the resistance item. If there are multiple path of electrical current flow (parallel circuit), there will be a current drop where the parallel path meets.

Ohms Law:

With some of the other electrical properties, the resistance of an object can be calculated.

$Ohms=Volts^{2}/Watts$

$Ohms=Watts/Amps^{2}$

$Ohms=Volts/Amps$