For any ciruit, the bigger the resistance, the smaller the current.
Resistance ( ohms ) = voltage ( volts ) / current ( amper )
Resistors gett hotter when a current passes through them. This is becuase the moving electrons bump into stationary atoms in the wire.
two resistors in a series have more resistance than just one on its own. This is because the battery has to push charges though both reisistors now.
Two reisistors in parallel have less resistance tha just one on its own. This is because there are now more paths for charges to flow through.
The resistance of a light dependant resistor ( LDR ) changes with light intensity. The darker it is the more resistance.
A thermistors resistance is dependant on temperature. The colder it is the more resistance.
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