Resistors

Tolerance (1)

Resistors have a specific tolerance, expressed as a percentage, 1%, 5%, 10% ...

A nominal 100 Ω, 10% tolerance resistor can have a actual value between 90 and 110 Ω

This has to be taken into account in circuits

Lower value gives higher current through resistor, higher power dissipation in resistor and lower voltage drop across resistor