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LED bulbs' are much more efficient at producing light than traditional incandescent bulbs. They initially cost more but last longer and use less electricity. An LED bulb than produces as much light as a 100 W incandescent bulb uses only 11.5 W. The LED bulb lasts around 12,000 hours and costs £12.00 whereas an incandescent bulb costs £1.40 but lasted just 750 hours. Assuming the electricity costs are £0.175 per kilowatt hour and that the bulbs are on for 3 hours a day. (a) Compare the total cost (including the price of the bulb) of running each bulb for 2.5 years (b) How much do you save over 2.5 years if you use and LED bulb instead of an incandescent bulb? (c) What is the resistance of a "100 W" equivalent LED bulb - remember it only uses 11.5

LED bulbs' are much more efficient at producing light than traditional incandescent bulbs. They initially cost more but last longer and use less electricity. An LED bulb than produces as much light as a 100 W incandescent bulb uses only 11.5 W. The LED bulb lasts around 12,000 hours and costs £12.00 whereas an incandescent bulb costs £1.40 but lasted just 750 hours. Assuming the electricity costs are £0.175 per kilowatt hour and that the bulbs are on for 3 hours a day. (a) Compare the total cost (including the price of the bulb) of running each bulb for 2.5 years (b) How much do you save over 2.5 years if you use and LED bulb instead of an incandescent bulb? (c) What is the resistance of a "100 W" equivalent LED bulb - remember it only uses 11.5

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Q3, LED bulbs are much more efficient at producing light than traditional incandescent bulbs. They initially cost more but last longer and use less electricity. An LED bulb than produces as much light as a 100 W incandescent bulb uses only 11.5 W. The LED bulb lasts around 12,000 hours and costs £12.00 whereas an incandescent bulb costs £1.40 but lasted just 750 hours. Assuming the electricity costs are £0.175 per kilowatt hour and that the bulbs are on for 3 hours a day. (a) Compare the total cost (including the price of the bulb) of running each bulb for 2.5 years (b) How much do you save over 2.5 years if you use and LED bulb instead of an incandescent bulb? (c) What is the resistance of a "100 W" equivalent LED bulb - remember it only uses 11.5 W of power when operating at 230 V.
Transcribed Image Text:Q3, LED bulbs are much more efficient at producing light than traditional incandescent bulbs. They initially cost more but last longer and use less electricity. An LED bulb than produces as much light as a 100 W incandescent bulb uses only 11.5 W. The LED bulb lasts around 12,000 hours and costs £12.00 whereas an incandescent bulb costs £1.40 but lasted just 750 hours. Assuming the electricity costs are £0.175 per kilowatt hour and that the bulbs are on for 3 hours a day. (a) Compare the total cost (including the price of the bulb) of running each bulb for 2.5 years (b) How much do you save over 2.5 years if you use and LED bulb instead of an incandescent bulb? (c) What is the resistance of a "100 W" equivalent LED bulb - remember it only uses 11.5 W of power when operating at 230 V.
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