Light Bulbs

Investigate the cost of using standard and energy saving light bulbs in a house. Can you find when the cost of running some standard bulbs equals the cost of running some energy saving bulbs? How many of each type of bulb? And for how long do you run them? What if you change the number of bulbs? Remember: Be systematic!
Incandescent (normal) light bulb
Energy saving light bulb (CFL)
Initial
cost
Running
cost per day
Number of light bulbs
day
day
Currency:
Cost
Number of days:
Total cost for
Total cost for
Total cost
Euro (€)
Pound (£)
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