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Published byIris George Modified over 4 years ago

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Circuits

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SC Standards Covered PS – 6.8Represent an electric circuit by drawing a circuit diagram that includes the symbols for a resistor, switch, and voltage source PS – 6.9Compare the functioning of simple series and parallel circuits

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Types of Circuits Series and Parallel

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What is a circuit? Electric Circuit – path that an electric current follows. –Open Circuit – break in path. Electricity can NOT flow through. –Closed Circuit – No breaks. Electricity can flow through.

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Circuit Diagrams

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Series Circuits In a series circuit, the current has only one pathway to travel. e-e- e-e- e-e-

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Series Circuit If one bulb goes out, they all go out Creates an open circuit

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Series Circuits Current is same throughout circuit (through each resistor). Current in entire circuit decreases with increased resistance (cumulative: add resistance to get total resistance).

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Checkpoint Series Circuit 1.What is total resistance? 2.What is the current? 3.What happens when one resistor (light bulb) burns out?

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Parallel Circuit In a parallel circuit, the current has multiple pathways to follow. e-e- e-e- e-e- e-e- e-e-

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Parallel Circuit Individual path for each item connected If one item goes out the others stay on Still a closed circuit

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Voltage in each path is same Total current in circuit increases if another path is added, the total resistance is reduced

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Using Chemical Cells (Batteries) Series Makes “Battery” Increases Total Voltage Parallel Makes “Battery” Total voltage does not change Makes batteries last longer

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Complex Circuits Combination of series and parallel circuits –In your house

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If we try to send too much current (too many electrons, too fast) through a circuit, the circuit will get hot and may cause a fire ! A FUSE has a metal strip that will melt if it gets too hot. This prevents the circuit from melting in another spot. Now you must replace the fuse.

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A CIRCUIT BREAKER has a metal strip that bends as it is heated. When it bends too much, it activates a switch that breaks the circuit. Once reset, the circuit breaker can be used again.

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Lab 1.Series Circuit with 3 light bulbs 2.Parallel circuit with 3 light bulbs 3.Complex circuit with 2 bulbs in series and the 3 rd in parallel to the other 2.

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