Code ch. 4 — a circuit from battery, bulb and switch: voltage, current, resistance, Ohm's law, power, series vs parallel, conductors and insulators.
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#electricity
3 entries across collections.
Code ch. 5 — signalling by wire between houses: circuits need a return path, shared commons and earth grounds, and why long wires dim the signal.
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Code ch. 7 — the telegraph key and sounder, why long lines fail, and the relay: a switch flipped by electricity that regenerates the signal.
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