Resistors (Ω) oppose current, are color-coded, and connect in series (Rt = ΣR) or parallel. Current-limiting resistors protect LEDs.

Know your way around an electric circuit? Show that you know your series circuits from your parallel circuits with BBC Bitesize.

What do series and parallel circuits have to do with Christmas lights? In this episode of Crash Course Physics, Shini walks us through the differences between series and parallel circuits and how ...

You can add a large additional guard-band by using 8x without greatly changing the value. Some fun points to ponder: The noise voltages of two resistors in series sum randomly and result is the same ...