INTRODUCTION TO BASIC ELECTRONIC DEVICES AND BASIC EMISSION THEORY

  •       FORCE

  • A force is a push or pull acting upon an object as a result of its interaction with another object. The unit of force is Newton(N). To calculate force we need to know the mass of an object. This is because force is the product of mass and acceleration.

  • FORCE = MASS X ACCELERATION


  • For example, if a man pulls up a 10kg mass. What force did he use? (take acceleration due to gravity, g = 10m/s2)

  • F = m x a = (10 x 10)N
  • F = 100N

  • This type of force due to gravitational pull is referred to as WEIGHT.

  • Remember that weight is also referred to as gravitational force.
  • However, there are various forces.such as frictional force, tension force, electrical force, normal force, magnetic force and lots more
  •  
  • Frictional force is the force that opposes the motion of two objects rubbing the surface of each other.                   

  • Mass and weight are similar but there are very big differences

  • 1. Mass is a fundamental or basic quantity measure in Kilograms, while weight is a derived quantity measure in Newton

  • 2. Every body or object has mass, whereas a body can be weightless without gravity. This implies that no mass, no weight.      

  • ELECTRONIC COMPONENTS
  • Electronic devices are sets of equipment that uses electronic components built into an electronic circuit to work.  You will work with a number of basic electronic components when building electronic circuits, including resistors, capacitors, diodes, transistors, and integrated circuits. Here is a brief overview of the functions of each of these basic electronic components.

  • Resistors

    A resistor is a component that resists the flow of current. It’s one of the most basic components used in electronic circuits. If you put resistors next to a penny, you get an idea of how small they are.

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  • Resistors come in a variety of resistance values (how much they resist current, measured in units called ohms and designated by the symbol Ωand power ratings (how much power they can handle without burning up, measured in watts).

  • Capacitors

    Next to resistors, capacitors are probably the second most commonly used component in electronic circuits. A capacitor is a device that can temporarily store an electric charge.

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  • Capacitors come in several different varieties, the two most common being ceramic disk and electrolytic. The amount of capacitance of a given capacitor is usually measured in microfarads, abbreviated μF.

  • These two devices and others are usually found in most electronic devices like radio, television, computer, phones, chargers, adaptors and lots more.

  • ACTIVITY

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