R Ch 35 Electric Circuits pg 1 Text RQ pg 559 RQ 3, 5, 7-9, 11-15.

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Presentation transcript:

R Ch 35 Electric Circuits pg 1 Text RQ pg 559 RQ 3, 5, 7-9, 11-15

R Ch 35 A Battery & a Bulb pg 2 For electrical things to operate there must be a complete path or circuit.

R Ch 35 Electrical Circuits pg 3 Closed circuit = an operating circuit Open circuit = a circuit which is not operating There are two kinds of circuits; 1) series circuits have a single path for the electrons to follow 2) parallel circuits have multiple paths for the electrons to follow

R Ch 35 Series Circuits pg 4 Series circuits have a single path for the electrons to follow. Series circuits are only used in cheap xmas lights because a single break in the circuit kills the whole circuit

R Ch 35 Parallel Circuits pg 5 Parallel circuits have multiple paths for the electrons to follow, so any one device can be turned off or on and not effect the rest of the circuit

R Ch 35 Schematic Diagrams pg 6 Schematic Diagrams are the blueprints or picture of the circuit that is drawn before the circuit is built. Schematic Diagrams have standard symbols for the different parts of the circuit

R Ch 35 Combing Resistors in a Compound Circuit pg 7 Circuit load = the total resistance of a circuit

R Ch 35 Parallel Circuits & Overloading pg 8 When more & pathways are added to a parallel circuit the resistance gets lower & lower. (think about adding more hoses to a pipe, more water would come out) So when too many xmas lights are plugged into a socket the danger exists of overheating the wires and causing a circuit overload or electrical short

R Ch 35 Parallel Circuits & Overloading pg 9 There are three ways to prevent overloads; 1) Fuse – one time use device that melts a metal strip sealed in glass, found in cars 2) circuit breaker – a reusable switch found in most homes 3)GFI – ground fault interrupt, a reusable switch found near water like bathroom sink