Electricity 1 — DC Circuits

Series & parallel

continues from lesson 1 — values defined earlier in the course stay live here

Series resistors stack: the current squeezes through both, so resistances ADD. Parallel resistors share: the current has two paths, so the combined resistance is SMALLER than either branch.

R_{2} := 100 ohm

= 100 ohm

R_{3} := 220 ohm

= 220 ohm

R_{ser} = R_{2} + R_{3}

= 320 ohm in series

R_{par} = \frac{1}{\frac{1}{R_{2}} + \frac{1}{R_{3}}}

= 68.75 ohm in parallel — smaller than R₂!

✓ pass

R_{par} < R_{2}

parallel always beats the smallest branch