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Published byErika Small Modified over 3 years ago

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Concept Summary Batesville High School Physics

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Circuit Schematics A schematic diagram is a symbolic representation of a circuit. A symbol represents each item in the circuit Lines represent wires (paths for charges).

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Circuit Symbols

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Three Types of Circuits Series Parallel Compound

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Series Circuits Series circuits have 1 path for charges to flow.

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Series Circuits Voltage may be different across different objects in a series circuit. Sum of the individual voltages = source voltage Current is the same in all parts of a series circuit. If one “goes out”, they all “go out”

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Parallel Circuits A parallel circuit has two or more paths for charges to move.

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Parallel Circuits Voltage is the same across each element in a parallel circuit. Current may vary through different elements in a parallel circuit. Sum of the individual currents = source current. If one “goes out”, the other “stays lit”.

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Compound Circuits A compound circuit has both series and parallel parts.

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Adding Resistance in Series When you add resistance in series: Total resistance increases Current decreases

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Equivalent Series Circuits R series = R1 + R2

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Adding Resistance in Parallel When you add resistance in parallel: Total resistance decreases Current increases

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Equivalent Parallel Circuits

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Household Circuits Household circuits are: parallel circuits Typically designed to carry 15 Amperes of current - maximum.

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Overloading Circuits Since adding resistance to a parallel circuit causes current to increase, adding appliances to a household circuit causes current in the house wiring to increase. This means wires must dissipate more heat energy (P = I 2 R).

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Short Circuits A short circuit is a very low resistance path in a circuit. A short circuit will also cause large amounts of current to flow in a circuit and overload the circuit.

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Fuses & Circuit Breakers Fuses and circuit breakers act as automatic switches in a circuit to prevent dangerous currents from flowing.

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The End

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