The two \({10}\Omega\) resistors are in parallel with each other. The two parallel networks are in series with each other. First, calculate the total resistance of each parallel network: ...

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

A handy nomograph quickly determines the equivalent resistance of two parallel resistors. Although you could use the standard formula and a calculator, the nomograph also lets you easily find ...