The Basic lessons · Circuit components · B-004-006
Reading Resistor Colour Codes and Understanding Tolerance
Learn how to decode the coloured bands on resistors to find their resistance value and precision. Understand how temperature affects resistance and why tolerance matters in circuit design.
This lesson is part of SignalPrep Pro. The subsection's 11 exam questions are free to practise: practise B-004-006.
What this subsection asks
- On resistors with four colour bands, which colour band specifies the tolerance?
- On a resistor with four colour bands, what do the first three colour bands indicate?
- On a resistor with four colour bands, what does the fourth colour band indicate?
- What are the possible values of a 100-ohm resistor with a 10% tolerance?
- On resistors with four colour bands, which colour band differentiates two resistors rated at 33 ohms and 39 ohms respectively?
- Out of the list of resistor tolerances below, which has the highest precision?
- Out of the list of resistor tolerances below, which has the lowest precision?
- How does the resistance of a resistor change with rising ambient temperature?
- Which resistor rating is specified as a given fraction per degree Celsius?
- On resistors with four colour bands, which colour band differentiates two resistors rated at 120 ohms and 1200 ohms respectively?
- Given that red=2, violet=7 and yellow=4, what is the nominal value of a resistor whose colour code reads "red," "violet" and "yellow"?