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

As explained by Arduino to Go, each color band on the resistor corresponds to a number but this can differ depending on the band's placement. It's not complicated, but the sheer number of colors ...

The following resistor network is set up. Calculate the total resistance of the network. This means that the three individual resistors can be replaced by one resistor of \({3.27}\Omega\). Adding ...