Provide "FLASHING LIGHT" on my question

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  xheavenlyx

  If you are asking how the intensity of your table lamp changes with a knob or switch then open your ES text book and look at a diagram that has a resistor and a voltage source. That will explain how intensity of a table lamp is controlled.
  
  You table lamp works by using power from your voltage source, could be a battery or wall socket (Voltage, V). The circuit also contains a resistor (Resistance, R) that 'resists' current in the circuit (lets call the current I). It is this current that gives a glow to your bulb as the current heats the tungsten element in the bulb.
  
  Now according to the most important law of electronics, the Ohms Law: I = V/R
  
  So, your Current is directly proportional to Voltage, and inversely to the Resistance of the circuit.
  
  Since your Voltage is constant, i.e: Wall socket or a battery, your knob on the table lamp changes the resistance of the circuit to make it brighter or softer! So lesser the resistance the more brighter the bulb, and inversely, the higher the resistance, the softer your bulb will glow.
  
  Hope you got it. Your Electronics book will explain it better, go through it too.