Which of the following statements is not true?a.Incandescent lamps are the most efficientb.Electrical Appliances have become more energy efficientc.A modern LED light is 60 percent more efficient than traditional incandescent lightsd.A LED light lasts up to 5 times longer

Compare the function of incandescent and fluorescent light bulbs and how this affects their efficiency.

Directions: Select the choice that best fits each statement. The following question(s) refer to the following energy efficiencies, expressed percentages.(A) 100%(B) 95%(C) 30%(D) 15%(E) 1%QuestionApproximate efficiency of the conversion of light energy to chemical energy in photosynthesis

Directions: Select the choice that best fits each statement. The following question(s) refer to the following energy efficiencies, expressed percentages.(A) 100%(B) 95%(C) 30%(D) 15%(E) 1%QuestionThe maximum efficiency possible in an energy-conversion process that is not limited by the second law of thermodynamics

How much energy do LED lights use compared to incandescent light bulbs?

Which of the following statements does NOT explain the meaning of the term ‘power’ in physics?The amount of energy transferred per secondThe rate at which energy is transferredThe rate at which work is doneThe total amount of energy which something has2An LED light bulb has a power rating of 6 W.  What does this mean?The bulb will use six ‘units of electricity’ per hourThe bulb must be connected to a 6 V power supplySix joules of energy are transferred to the bulb every secondThe bulb will only light once six joules of energy have been transferred to it3An athlete runs up a flight of stairs in 10 seconds and 16 kJ of energy is transferred to their gravitational potential store.  Calculate their power output.  You may neglect all other energy transfers in answering this question.1.6 W160 W160,000 W1600 W4The output of a mobile phone charger is labelled ‘5 V, 1 A, 5 W’.  How much electrical energy will be supplied by the charger when it runs steadily for ten minutes?50 J3 kJ250 J15 kJ5A car of mass 2000 kg accelerates from rest to 20 m/s in 10 seconds.  Calculate the average power output of its engine.  In answering this question, you may assume that all of the energy which is supplied by the car’s engine is transferred to its kinetic store.4,000 W40,000 W4,000,000 W400,000 W6During a television programme, 180 kJ of energy was transferred to a 100 W television.  How long was the programme?18 seconds1,800 seconds18,000 seconds546 seconds