* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Grade 9 Applied Science – Electricity
Survey
Document related concepts
Wien bridge oscillator wikipedia , lookup
Schmitt trigger wikipedia , lookup
Crystal radio wikipedia , lookup
Lumped element model wikipedia , lookup
Printed circuit board wikipedia , lookup
Surge protector wikipedia , lookup
Rectiverter wikipedia , lookup
Electrical engineering wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Electronic engineering wikipedia , lookup
Opto-isolator wikipedia , lookup
Regenerative circuit wikipedia , lookup
Index of electronics articles wikipedia , lookup
Flexible electronics wikipedia , lookup
Transcript
Grade 9 Applied Science – Electricity Drawing, Reading and Building Electrical Circuits Drawing, reading and building electrical circuits is an important skill…especially for electrical engineers, electricians, building contractors and scientists. There are two types of circuits: (1) series and (2) parallel. As shown in the diagram below, a series circuit is one single path; whereas, a parallel circuit has numerous paths. In the following table, list other features of each type of circuit that you have observed from building some circuits in class. Table 1. Features of Series and Parallel Electrical Circuits Feature Series Circuit If one light bulb is removed All lights in the circuit go out Parallel Circuit All other bulbs still work Brightness of bulb as more bulbs are added to the circuit Voltage in circuit as more bulbs are added to the circuit Electrical Symbols Table 2. Some Common Electrical Symbols Using the correct electrical symbol is important….otherwise, you might build the wrong thing. NOTES A Voltmeter measure the potential difference or voltage drop across a load in a line (e.g., light, resistor, bell, motor). As such, the Voltmeter is always drawn and installed PARALLEL to the load being measured An Ammeter measures current. The Ammeter is drawn and installed in the circuit (SERIES) The flow of electrons in an electrical circuit is from the NEGATIVE terminal to the POSITIVE terminal of the power source (e.g., battery). In the symbol for a battery, the smaller line is the negative terminal. A symbol for a two-celled battery highlighting the different terminal charge positions is shown. Task On separate pieces of paper, draw the following electrical circuits 1. A circuit with a three-cell battery and two lights. The two lights are in a parallel circuit. One switch turns both lights on and off. 2. A circuit with a two-cell battery with three lights. Two lights are in a series circuit while the other light runs in a circuit parallel to the other two lights. A switch is added that controls the lights in the series circuit. A voltmeter measures the voltage drop across the light in the parallel circuit. 3. A circuit with a four-cell battery and four lights, one electrical motor and one resistor (Resistance unknown). Three lights are wired in a series circuit. The fourth light is wired in a circuit parallel to the other three lights. The parallel circuit also has a motor that is wired in series to the fourth light. Another parallel circuit has the resistor. A voltmeter is wired to the resistor circuit to measure the potential difference across the resistor. A switch controls the three lights in series and another switch controls the light and motor. Using the circuit boards and other equipment, build Circuit 1 and Circuit 2 using your electrical drawing. Review your circuits with the teacher. Exchange your Circuit 3 drawing with a neighbor and build Circuit 3 according to the drawing of your neighbor. Compare your Circuit 3 with your neighbour’s circuit. Do they work? Are they similar? What differences, if any, exist? If so, who is right?