Resistance

Resistance is measured in ohms(Ω) and it is a measure of how well something can restrict the flow of electric current.

Resistance (R) can be calculated by dividing the voltage across a component (V) by the current flowing through it(I), in amps.

Light dependent resistors (LDR) and thermistors both conduct electricity better when there is more energy around. This happens when it is brighter or warmer.

Resistors in series add up, but resistors in parallel go down, usually to 1/2, 1/3, and 1/4 of the original resistance as you add more resistors in parallel.