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Electricity Within a Circuit An electric circuit is a continuous pathway for charges to move. Circuit Elements and Diagrams Circuits have 4 basic components: 1) Source – source of electric energy (where the electricity is coming from) (battery) 2) Conductor – the wire through which the energy flows (wire) 3) Control – a switch or device that can turn the circuit on or off. (switch) 4) Load – items along the circuit that convert electricity into other forms of energy (examples: light bulbs, motors, heaters, speakers). Draw fig 4.9 on page 273 into notes. Read circuit diagram criteria Draw circuit symbols into notes. Do extension on page 272 (a, b). BLM 4-5 Current Electric current: - is the amount of charge that passes a point in a conducting wire every second. - is measured in amperes (A) by an ammeter. (weaker electric currents are measured by a galvanometer). - within in a circuit, negative charges (electrons) flow on a path from the negative terminal of a battery to the positive terminal of the battery. - is similar to a rivers current. A strong river current means that water flows rapidly; a fast flow rate. Voltage - is the energy of each individual charge. - The symbol is V and the units are volts (V) - Voltage is the push that makes electrons move. Demonstration on Current and Voltage Page 276-277 Hand in analyze questions #1-5 on page 276. On page 277 hand in questions #1-6 Rivers of Electricity Read page 278 Energy of a moving electric charge is changed to different forms as current passes through the load (ex. Changed to light energy or mechanical energy) Page 278 #1-3, 5.