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Electronics: Ohm's Law

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Key Concepts

Parallel and Serial Circuits Voltage Drops are always meaasured in parallel Current Flows are always measured in searial (must break the circuit to do this) Carbon is the single most common material for resistors. Usually coated in plastic. "Resistor Color Code" Not all materials (or geometric configurations) obey Ohm's Law. Then you use the Impediance Law which extends it. A loop of wire (an "inductor") generates a magnetic field. The symbol for a coil is "L". Two parallel plates of metal (a "capacitor") generates an electric field. The symbol for a capacitor is "C". "ELI the ICE man" ^ ^

Going Further

Even a battery has an internal resistance. Design an experiment to measure this. If instead of a battery (or other DC - direct current) source, we use a AC (alternating current - eg, from the wall outlet). R still acts the same, C and L do NOT (ELI the ICE man knows ;) Capacitors can filter out noise. Coils and capacitors can be used to boost the base of an audio system. "Resonance Circuit"

Much further afield

Kirchov's Law Norton's Theorem Thevenin's Theorem -[]- -[]- -[]-


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