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The ICT in Schools Initiative of the Department of Education and Science Basic Electronics.

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Presentation on theme: "The ICT in Schools Initiative of the Department of Education and Science Basic Electronics."— Presentation transcript:

1 The ICT in Schools Initiative of the Department of Education and Science Basic Electronics

2 The ICT in Schools Initiative of the Department of Education and Science Electric Circuit Components are connected together with electrical wire to form a closed loop. Components are represented by symbols

3 The ICT in Schools Initiative of the Department of Education and Science Electric Circuit Electrical wire used to connect components is a conductor. A conductor allows electric current to flow through it easily. Good conductors include: copper, gold, silver, tin Copper wire is generally used as it is most cost effective. All electrical wires have a plastic cover. Plastic is an insulator. An insulator does not allow current to flow through it. Avoids electric shock. Insulators include: plastic, glass, wood

4 The ICT in Schools Initiative of the Department of Education and Science Electric Circuit Electric Current is the flow of electrons around a circuit. Electrons have a negative charge

5 The ICT in Schools Initiative of the Department of Education and Science Electric Circuit Electric current is measured with an Ammeter The ammeter is placed into the circuit (in series) Unit of measurement is the Ampere or amp Represented by the letter I

6 The ICT in Schools Initiative of the Department of Education and Science Electric Circuit EMF (electromotive force) is the force that makes electrons flow around a circuit. EMF is often called Voltage and is provided by the battery. Higher voltage = more current

7 The ICT in Schools Initiative of the Department of Education and Science Electric Circuit Voltage is measured using a Voltmeter. The voltmeter is placed across a component (in parallel) Unit of measurement is the Volt. Represented by letter V.

8 The ICT in Schools Initiative of the Department of Education and Science Electric Circuit Resistance is the opposition to the flow of electric current. All components have resistance. Electrical wire has resistance. Unit of measurement is the Ohm (Ω) Represented by the letter R

9 The ICT in Schools Initiative of the Department of Education and Science Electric Circuit Resistance is the opposition to the flow of electric current. All components have resistance. Electrical wire has resistance. Unit of measurement is the Ohm (Ω) Represented by the letter R

10 The ICT in Schools Initiative of the Department of Education and Science Ohms Law Voltage, Current & Resistance are calculated using Ohms Law V I R

11 The ICT in Schools Initiative of the Department of Education and Science Series Circuit Components are connected one after the other There is only one path for current to flow around

12 The ICT in Schools Initiative of the Department of Education and Science Series Circuit The current at all points in a series circuit is equal

13 The ICT in Schools Initiative of the Department of Education and Science Series Circuit The voltage is shared between the components in a series circuit. Components of equal resistance – voltage is shared equally

14 The ICT in Schools Initiative of the Department of Education and Science Series Circuit The voltage is shared between the components in a series circuit. Components of unequal resistance – voltage is shared proportionally

15 The ICT in Schools Initiative of the Department of Education and Science Parallel Circuit Components are connected side by side There is more than one path for current to flow around

16 The ICT in Schools Initiative of the Department of Education and Science Parallel Circuit The voltage across each path is always the same as the applied voltage When component resistance in each path is the same

17 The ICT in Schools Initiative of the Department of Education and Science Parallel Circuit The voltage across each path is always the same as the applied voltage When component resistance in each path is different

18 The ICT in Schools Initiative of the Department of Education and Science Parallel Circuit The voltage across each path is always the same as the applied voltage When there is more than one component in a path

19 The ICT in Schools Initiative of the Department of Education and Science Parallel Circuit The current is divided between the paths proportionally (Ohms Law)

20 The ICT in Schools Initiative of the Department of Education and Science Motor Control SPST Switch: Polarity connection determines direction of rotation

21 The ICT in Schools Initiative of the Department of Education and Science Motor Control DPDT Switch: Forward and reverse control of motor

22 The ICT in Schools Initiative of the Department of Education and Science Motor Control DPDT Switch +V C3 C4 C1 0V C2

23 The ICT in Schools Initiative of the Department of Education and Science Motor Control DPDT Switch: Wiring Diagram

24 The ICT in Schools Initiative of the Department of Education and Science Motor Control DPDT Switch: Wiring Diagram

25 The ICT in Schools Initiative of the Department of Education and Science Motor Control DPDT Switch: Wiring Diagram

26 The ICT in Schools Initiative of the Department of Education and Science Motor Control DPDT Switch: Wiring Diagram +V 0V

27 The ICT in Schools Initiative of the Department of Education and Science Motor Control Forward and reverse control of motor with limit switches

28 The ICT in Schools Initiative of the Department of Education and Science Motor Control Forward and reverse control of motor with limit switches Wiring Diagram +V 0V

29 The ICT in Schools Initiative of the Department of Education and Science Motor Control Forward and reverse control of motor with limit switches

30 The ICT in Schools Initiative of the Department of Education and Science Motor Control Forward and reverse control of motor with limit switches Wiring Diagram +V 0V

31 The ICT in Schools Initiative of the Department of Education and Science Motor Control Will SW1 and SW2 act as limit switches in this circuit?

32 The ICT in Schools Initiative of the Department of Education and Science Sensors Light Dependent Resistor (LDR) Resistance increases as darkness increases

33 The ICT in Schools Initiative of the Department of Education and Science Sensors Thermistor Resistance decreases as the temperature increases

34 The ICT in Schools Initiative of the Department of Education and Science Transistor Acts as a switch Voltage > 0.6V-0.7V between the base and emitter transistor is on CollectorEmitterBase BFY51 Collector BFY51 EmitterBaseCollector BFY51 CollectorBase BFY51 CollectorBaseEmitterBase E B C

35 The ICT in Schools Initiative of the Department of Education and Science Transistor Voltage Divider circuit is used to create the turn on voltage between the base and emitter.

36 The ICT in Schools Initiative of the Department of Education and Science LDR Transistor Circuit An LDR changes the voltage according to light levels Dark = LED on

37 The ICT in Schools Initiative of the Department of Education and Science Relay A relay is a switch used to turn other circuits on and off DPDT switch Coil terminals are part of controlling circuit

38 The ICT in Schools Initiative of the Department of Education and Science Relay Position A

39 The ICT in Schools Initiative of the Department of Education and Science Relay Position A P1 NC1 NO2

40 The ICT in Schools Initiative of the Department of Education and Science Relay Position B

41 The ICT in Schools Initiative of the Department of Education and Science Relay Position B P2 NC2 NO2

42 The ICT in Schools Initiative of the Department of Education and Science Relay


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