circuits chapter 13.3. electric circuit an electrical device connected so that it provides one or...
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CIRCUITS
Chapter 13.3
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Electric Circuit
• An electrical device connected so that it provides one or more complete paths for the movement of charges.
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Schematic Diagram
• A graphic representation of an electric circuit or apparatus, with standard symbols for the electrical devices.
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Wire or Conductor
• Wires that connect elements are conductors.
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Resistor
• Wires with multiple bends indicating resistance to a straight path.
http://images1.wikia.nocookie.net/en.futurama/images/0/0d/200px-Resistor_symbol_America.svg.png
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Bulb or Lamp
• The winding of the filament indirectly indicates that the light bulb is a resistor.
http://cnx.org/content/m14370/latest/Schematic.png
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Battery or Direct Current Source
• The difference in line height indicates a voltage between positive and negative terminals of the battery. The taller line represents the positive terminal of the battery.
http://cnx.org/content/m14370/latest/Schematic.png
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Switch
• The small circles indicate the two places where the switch makes contact with the wires. Most switches work by breaking only one of the contacts.
Open switch
Closed switch
http://www.highschoolresource.energyaustralia.com.au/studentsElectricCircuits.html
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Series Circuits
• A circuit that provides a single path for current to flow.
• As you add resistors, the total resistance (RT) of the circuit increases causing the total current to decrease.
• The current through each resistor is the same no matter what the value of the resistor.
• The voltage of the battery is shared between each resistor.
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Series Circuit
• If three lamps are connected in series and one lamp burns out, all the lamps are not going to light. The circuit will be broken.
• As identical lamps are added in series, the light will get dimmer because less current is flowing through the lamps
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Parallel Circuit
• A circuit that provides two or more paths for current to flow.
• As you add resistors, the total resistance (RT) in the circuit decreases causing the total current to increase.
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Parallel Circuit
• The current through each resistor depends on the value of that particular resistor. The higher the resistance, the lesser the current that passes through the resistor.
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Parallel Circuit
• The voltage of the battery is the same across each resistor. Each resistor gets the same voltage value of the battery.
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Parallel Circuits
• If three lamps are connected in parallel and one lamp burns out, all the other lamps are still going to light. There is still a circuit intact.
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Parallel Circuit
• As identical lamps are added in parallel, the brightness of the lamps will not change. More current is added.
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Series Circuit Parallel Circuit