Ohm's Law

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Reference Material

  • Horowitz & Hill, The Art of Electronics, 2nd Ed., Ch. 1

Ohm’s Law

where is voltage, measured in Volts (), with typical values ranging from (into an oscilloscope) to (power lines, severe arcing danger); is current, measured in Amperes (), typical values ranging from (relatively safe for bench-top work) to (very dangerous); is resistance, measured in Ohms (), typical values ranging from (power resistors dissipating a lot of power) to (almost a no-connect).



Symbol for a resistor in schematics

A resistor resists the flow of electrons, such that a potential (i.e. voltage) is required to produce a current, as described by Ohm’s Law above. As per all electronic components, resistors dissipate energy as heat according to the equation:

Resistors in Series

Resistors in series add:

Resistor series.png

Resistors in series

Resistors in Parallel

Resistors in parallel add reciprocally:

Resistor parallel.png

Resistors in parallel

Reading Resistor Values

Resistor bands.png

Color band locations on resistors

Color chart.png

Matching colors to values