Resistor

Resistors “resist” the flow of electricity and are used to control or limit the current in a circuit. This set includes a 5.1k-ohm resistor (R3) (“k” symbolizes 1,000, so R3 is really 5,100 ohms). Materials like metal have very low resistance (<1 ohm), while materials like paper, plastic, and air have near-infinite resistance. Increasing circuit resistance reduces the flow of electricity.