A resistor is a two-terminal electrical component that opposes the passage of an electric current. Resistor reduces current flow, adjusts signal levels, divides voltages, and terminates transmission lines. Resistors are used as part of motor control, power distribution systems also as test loads for generators. Resistors are one of the most common elements you will see in any electrical network or circuit.
1/8, 1/4W, 1/2W until 5W ratings indicate the maximum power that the resistor is able to handle for temperatures lower than 70°C.