An energy-efficient light bulb transforms 100 J of input energy into 75 J of light energy. Another 25 J of heat energy is produced as waste.Calculate the light bulb's energy efficiency
Question
An energy-efficient light bulb transforms 100 J of input energy into 75 J of light energy. Another 25 J of heat energy is produced as waste.Calculate the light bulb's energy efficiency
Solution
The energy efficiency of a device can be calculated using the formula:
Efficiency = (Useful energy output / Total energy input) * 100%
In this case, the useful energy output is the light energy produced by the bulb, which is 75 J. The total energy input is the energy used by the bulb, which is 100 J.
So, the energy efficiency of the light bulb is:
Efficiency = (75 J / 100 J) * 100% = 75%
Therefore, the energy efficiency of the light bulb is 75%.
Similar Questions
A 100-W light bulb is left on for 8.0 hours. Over this period of time, how much energy was used by the bulb?Select one:a.2 880 000 Jb.28 800 Jc.1.34 hpd.800 Je.288 000 J
What is the electrical efficiency of a 100 Wlight bulb that produces 5.7 kJ (57 000 J) ofheat when it is on for 10 min? (Hint: remem-ber that the bulb is supposed to producelight.) Show your work
A lamp is switched on for 2.0 hours. The power input to the lamp is 1.0 W. The energy given outby the lamp as light is 7.0 10 3 J.How much energy is converted to other forms by the lamp?A 120 J B 200 J C 3400 J D 7200 J
A 4-W night-light is plugged into a 120-V circuit and operates continuously for 1 year. Find the following: (a) the current it draws, (b) the resistance of its filament, (c) the energy consumed in a year. Group of answer choices0.033 A; 3600 W; 35 kWh0.033 V; 3600 kW; 35 kWh0.033 A; 3600 J; 35 Wh30 A; 3600 W; 35 kJ
A lamp transfers 54 KJ of energy.Calculate the power of this lamp if it is used for 1 hour.Power = _____ W0.0151590054 000
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.