filament lamps

• what is a filament lamp?

  a very thin metal (tungsten) filament in a glass bulb. when it gets hot, it gives out light. they are low in efficiency.
• method for filament lamp practical

  set up the circuit

  vary the voltmeter reading

  measure the current

  plot a graph

  take care over one of best fit

  describe pattern

  write conclusion
• resistance of a filament lamp increases with temperature as the current increases, the filament lamp heats up more and the resistance increases.