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Electricity and Electronic Lesson 2, Technology Sección bilingüe Xosé M. Rodríguez
Electrical magnitudes ,[object Object],[object Object],[object Object]
Ohm's law. ,[object Object]
Resistors association ,[object Object]
Resistors association ,[object Object]
Electronic devices http://www.bbc.co.uk/schools/gcsebitesize/design/electronics/materialscomponentsrev1.shtml
Resistors A  resistor   is a two-terminal electronic component designed to oppose an electric current by producing a voltage drop between its terminals in proportion to the current. Color code of resistors
Variable resistors A potentiometer is a  three-terminal resistor with a sliding contact  to change the value. Potenciometer . LDR  (Light Dependent Resistor) Is a resistor whose resistance decreases with increasing incident  light intensity Temperature Dependent Resistors NTC PTC  Is a resistor whose resistance increases with increasing temperature. Is a resistor whose resistance decreases with increasing temperature.
Semiconductors ,[object Object],[object Object],Forward  Reverse
LED A  LED  is a semiconductor diode that  emits light  when an electric current is applied in the forward direction of the device.
Transistor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NPN PNP
Transistors  are easily damaged, so it is important not to mix up the three leads. To help identify the leads some transistors have a dot near the collector, and/or a tab near the emitter. Each type of transistor is identified by a code printed on the side and then you can learn about it in the  datasheet .
Transistors: regions of operation ,[object Object],[object Object],[object Object]
Some transistors
Darlington pairs Some transistors can take a very low current flowing in the base and amplify it to give a much higher current in the collector (called  gain ). Other transistors can output a large current at the collector - but without very much gain. Single transistors cannot have both high gain and high collector current. To overcome this problem, a high-gain transistor is paired up with a high-current transistor in what is called a  Darlington pair .  The combined transistors allows both a higher gain and a larger amount of current to flow than would be possible with a single transistor . Darlington pairs are often used to drive motors.
Transistor ,[object Object]
Capacitor ,[object Object],[object Object],[object Object],[object Object],[object Object]
Some capacitors
Relay ,[object Object]
 
 
Very simple circuit Light sensor
Vin Potential divider
I Base Cutoff : I BASE  = 0 A  =>  I Collector  = 0 A Saturation :  I BASE   is high  =>  I Collector  = I CSAT I collector BC548 I CSAT  = 10 mA Look for this data in the web (datasheet) I emitter
 
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Electricity and Electronic

  • 1. Electricity and Electronic Lesson 2, Technology Sección bilingüe Xosé M. Rodríguez
  • 2.
  • 3.
  • 4.
  • 5.
  • 7. Resistors A resistor is a two-terminal electronic component designed to oppose an electric current by producing a voltage drop between its terminals in proportion to the current. Color code of resistors
  • 8. Variable resistors A potentiometer is a three-terminal resistor with a sliding contact to change the value. Potenciometer . LDR (Light Dependent Resistor) Is a resistor whose resistance decreases with increasing incident light intensity Temperature Dependent Resistors NTC PTC Is a resistor whose resistance increases with increasing temperature. Is a resistor whose resistance decreases with increasing temperature.
  • 9.
  • 10. LED A LED is a semiconductor diode that emits light when an electric current is applied in the forward direction of the device.
  • 11.
  • 12. Transistors are easily damaged, so it is important not to mix up the three leads. To help identify the leads some transistors have a dot near the collector, and/or a tab near the emitter. Each type of transistor is identified by a code printed on the side and then you can learn about it in the datasheet .
  • 13.
  • 15. Darlington pairs Some transistors can take a very low current flowing in the base and amplify it to give a much higher current in the collector (called gain ). Other transistors can output a large current at the collector - but without very much gain. Single transistors cannot have both high gain and high collector current. To overcome this problem, a high-gain transistor is paired up with a high-current transistor in what is called a Darlington pair . The combined transistors allows both a higher gain and a larger amount of current to flow than would be possible with a single transistor . Darlington pairs are often used to drive motors.
  • 16.
  • 17.
  • 19.
  • 20.  
  • 21.  
  • 22. Very simple circuit Light sensor
  • 24. I Base Cutoff : I BASE = 0 A => I Collector = 0 A Saturation : I BASE is high => I Collector = I CSAT I collector BC548 I CSAT = 10 mA Look for this data in the web (datasheet) I emitter
  • 25.