Light Bulb Resistance

Added by Craig Napier on Dec 15, 2008

This activity uses circuit models to show that a bulb's resistance will increase with increasing current, and explains that this is due to the bulb filament warming up. Pupils should be able to analyse their results by scaling and plotting a line graph, and describe a graph with a dependent variable that has a decreasing rate of increase.

This item teaches:

  • about the relationship between the resistance of a bulb and the current flowing through it

Contents

Objectives

  • The pupils should know that a bulb's resistance increases with increasing current.
  • The pupils should know that the resistance increase is due to the bulb filament warming up.
  • The pupils should be able to scale and plot a line graph from a table.
  • The pupils should be able to describe a graph with a decreasing rate of increase of the dependent variable.

Models

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