Junior Cycle Science Energy: Compact fluorescent lamps (CFLs)

Question

Compact fluorescent lamps (CFLs) are more energy efficient than incandescent (tungsten filament) bulbs. A 20 W (0.02 kW) CFL bulb has the same light output as a 115 W (0.115 kW) incandescent bulb.

If incandescent (tungsten filament) bulbs were replaced by compact fluorescent lamps (CFLs) in Ireland it is estimated that this would reduce our CO2 emissions by 700,000 tonnes each year and reduce our household electricity bills by €185,000,000.

(i) Why would replacing incandescent bulbs lower our CO2 emissions?

(ii) Name this second form of energy.

(iii) Which form of energy does the more efficient bulb produce more of?

A 20 W (0.02 kW) CFL bulb is equivalent to 115 W (0.115 kW) incandescent bulb. Electricity costs 15 cent per kWh.

(iv) Calculate the cost of using each of these bulbs for 100 hours.  
Cost for the CFL  
Cost for the incandescent bulb

(v) Name another electrical appliance where checking the energy efficiency rating would be important to save money on running costs.

Compact fluorescent lamps (CFLs) are more energy efficient than incandescent (tungsten filament) bulbs - Junior Cycle Science - Question b - 2011

Worked Solution & Example Answer:Compact fluorescent lamps (CFLs) are more energy efficient than incandescent (tungsten filament) bulbs - Junior Cycle Science - Question b - 2011

Why would replacing incandescent bulbs lower our CO2 emissions?

Name this second form of energy.

Which form of energy does the more efficient bulb produce more of?

Calculate the cost of using each of these bulbs for 100 hours.

Name another electrical appliance where checking the energy efficiency rating would be important to save money on running costs.

Join the Junior Cycle students using SimpleStudy...