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Electricity (Electronic components (Variable resistors (Potentiometer (It…

- - - - It is a type of resistor whose value can be modified by a moveable piece.
    - - It is a resistance that depends on temperature
        
        NTC
        
        PTC
    - - The resistance varies according to the amount of light the resistor receives; it diminishes as light increases
  - - - LED
  - - - Base
      - Collector
      - Emitter
- - - - It is measured in volts (V)
  - - - It is measured in amperes or amps (A).
    - - Heat
        
        by the temperature of the cable
      - Electromagnetism
        
        electromagnet
      - Light
        
        Lights bulbs
        
        Fluorescent tubes
- - - - It is the reciprocal of electrical resistivity
        
        Insulators
        
        Don't allow electric currents
        
        Wood , plastic...
        
        Conductors
        
        Allow electric currents to pass through them.
        
        All the metals
        
        Semiconductors
        
        They are intermediate between conductors and insulators
    - - It is a measure of degree to which the material opposes an electric current flowing through it
  - - - Provide the energy
        
        Battery
    - - Transform the electricity
        
        Light bulb
        
        Motor
        
        Resistor
        
        Bell
    - - Control the energy
        
        Push button
        
        Circus switch
        
        switch
    - - Fuses
      - Breaker switches
      - Earth-leakage circuit breaker
- - - - 1J=0.24 cal
    - - 1cal=4.18 J
  - - - Watts
      - KiloWatts( 1000 Watts)