10.2: electricity and electric circuits. static vs. current electricity static electricity: charges...
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Post on 26-Dec-2015
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- 10.2: Electricity and Electric Circuits
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- Static vs. Current Electricity Static Electricity: charges build up in one location Current Electricity: electrons on the move
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- Current Electricity to operate electrical devices, you need a steady flow of electrons. Current electricity is the continuous flow of electrons in a circuit. The electrons flow continuously if the following conditions are met: 1.there is a continual supply of energy 2.the electrons have a a complete path to flow through (electric circuit)
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- Electric Circuits An electric circuit must include: 1.An energy source energizes the electrons, ex. battery, photoelectric cell in calculator 2.a conducting wire (connector) provides a path for current to flow 3.A load which is a device that converts electrical energy to another form of energy, ex. light bulb Many electric circuits also include a switch that turns the circuit on or off by closing or opening the circuit.
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- Examples of Loads Converts electricity to light bulblight energy fanmechanical energy doorbellsound energy
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- Schematic Circuit Diagrams engineers and designers of electrical circuits use special symbols that show the components and connections in a circuit. a drawing made with these symbols is called a circuit diagram.
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- Schematic Circuit Diagrams Follow these rules when you draw circuit diagrams. 1. Always use a ruler to draw straight lines for the conducting wires. 2. Make right-angle corners so that your finished diagram is a rectangle.
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- Circuit Symbols Conductor or wire allows current to flow very easily from one part of a circuit to another.
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- Circuit Symbols Cell - supplies electrical energy -the positive end is bigger than the negative end.
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- Circuit Symbols 2 Cells Note: every time a cell is added you need to draw another cell; a battery is a combination of two or more cells
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- Circuit Symbols Ground a connection to earth
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- Circuit Symbols Switch - an on-off switch allows current to flow only when it is in the closed (on) position
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- Circuit Symbols Lamp a load which converts electrical energy to light
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- Circuit Symbols Resistor A resistor restricts the flow of current
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- Circuit Symbols Ammeter device that measures current A
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- Circuit Symbols Voltmeter device that measures voltage V
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- Circuit Symbols Motor -electrical load that converts electrical energy into movement M
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- Circuit Building Draw the circuit diagrams for each circuit described on the handout Now try building the circuit (substitute the buzzers for the motors)
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