ESE 121 Lecture Notes - Lecture 14: Werner Von Siemens, Series And Parallel Circuits, Resistor

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Ese 121 lecture 12: electric circuits: circuit symbols. Examples: a circuit consists of a single battery, a light bulb and a switch. Place the three components together so that the switch turns on the bulb. To add parallel resistances, you add the reciprocal of the resistances. For example: (cid:4666)(cid:883)/(cid:4666)(cid:4666)(cid:883)/(cid:883) (cid:4667)+(cid:4666) (cid:883)(cid:884)k (cid:4667)+(cid:4666) (cid:883)(cid:885)k (cid:4667)(cid:4667)=(cid:887)(cid:886)(cid:887) : this can seem a bit weird at first. When adding resistors in parallel, more resistors equal less resistance: let"s step back for a minute to discuss electric potential. In our water tower model, the water starts with some potential and flows out of the spout and turns a few water wheels. By the time the water is laying in a puddle on the ground, all of the potential has been used up. The same goes for electric potential: the sum of all the voltages in the circuit must equal zero. In a series circuit, the resistors with the highest resistance have the largest voltage drop.

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