Parallel resistors

Components with 2 terminals (pins/wires) are connected in parallel when each of their terminals are connected to just one of the other component’s terminals. Each electrical connection point is called a node.

I assume you already know:

Basic properties

Two equal value parallel resistors will conduct twice the current for a given voltage by providing half the equivalent resistance diagram by Electronzap Electronzapdotcom
Two equal value parallel resistors will conduct twice the current for a given voltage by providing half the equivalent resistance diagram by Electronzap Electronzapdotcom
  • Conductance – Siemens – Mhos More in depth page covering conductance.
  • Equivalent resistance is less than the lowest value parallel resistor. Their conductance adds up.
  • Equal value parallel resistors are the easiest to calculate. The equivalent resistance is a fraction of the value of each equal value parallel resistor. 1/2 for 2 parallel resistors, 1/3 for 3 parallel resistors, etc. For example, two || (parallel) 1,000Ω resistor will look like a single 500Ω resistor to the rest of the circuit. While three || 1KΩ resistors will look like a single 333Ω resistor.
  • Since more than one resistor is providing current, they also split up the heat generation.
  • Formula is (1/Req) = (1/R1)+1/R2)….+(1/Rn)

Video

Two parallel 1K quarter watt resistors act like a 500 ohm half watt resistor measured and thermal

Bonus diagram

3 or more unequal resistors connected in parallel by electronzapdotcom of YouTube and electronzap
3 or more unequal resistors connected in parallel by electronzapdotcom of YouTube and electronzap
Good followup topics
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