Electricity 1 — DC Circuits
Ohm’s law, series & parallel circuits, the voltage divider, real energy costs, and RC charging.
Three quantities run everything electrical: voltage (the push, in volts), current (the flow, in amps), and resistance (the squeeze, in ohms). Ohm's law ties them together, and almost everything else in this course is bookkeeping built on top of it. Every value below carries real units the engine tracks for you.
- 01 Ohm's law & power ELI5: think of electricity as water in a pipe: voltage is the water pressure, current is the flow rate, resistance is how narrow the pipe is. I = V/R — push…
- 02 Series & parallel ELI5: resistors in series sit end-to-end, so the current fights through both — resistances add up. Resistors in parallel give the current two paths at once, so…
- 03 The voltage divider ELI5: two resistors in series split the supply voltage in proportion to their sizes — the bigger resistor keeps the bigger share. It's the single most-used…
- 04 What electricity costs ELI5: your meter bills energy (kilowatt-hours), not power — and energy is just power × time. The engine carries the units, so watts × hours comes out as an…
- 05 Capacitors — charging up ELI5: a capacitor is a tiny bucket for charge. Through a resistor it fills exponentially — fast at first, then ever slower. The time constant τ = R·C sets the…
next course: Electricity 2 — AC Circuits →