Current Electricity and Electric Circuits. Static vs. Current Electricity Static Electricity: charges build up in one location Current Electricity: electrons.
Post on 14-Dec-2015
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Current Electricity and Electric Circuits Slide 2 Static vs. Current Electricity Static Electricity: charges build up in one location Current Electricity: electrons on the move Slide 3 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) Slide 4 Electric Circuits An electric circuit must include: 1.An energy source energizes the electrons, ex. battery 2.a conducting wire (connector) provides a path for current to flow 3.A load 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. Slide 5 Examples of Loads Converts electricity to light bulblight energy fanmechanical energy doorbellsound energy Slide 6 Schematic Circuit Diagrams special symbols that show the components and connections in a circuit. a drawing made with these symbols is called a circuit diagram. Slide 7 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. Slide 8 Circuit Symbols Conductor or wire allows current to flow very easily from one part of a circuit to another. Slide 9 Circuit Symbols Cell - supplies electrical energy Slide 10 Circuit Symbols Battery: a combination of two or more cells Slide 11 Circuit Symbols Ground a connection to earth Slide 12 Circuit Symbols Switch - an on-off switch allows current to flow only when it is in the closed (on) position Slide 13 Circuit Symbols Light Bulb a load which converts electrical energy to light Slide 14 Circuit Symbols Resistor A resistor restricts the flow of current Slide 15 Circuit Symbols Ammeter device that measures current A Slide 16 Circuit Symbols Voltmeter device that measures voltage V Slide 17 Circuit Symbols Motor -electrical load that converts electrical energy into movement M Slide 18 Circuit Building Draw the circuit diagrams for each circuit described on the handout