An energy-saver light-bulb of 11w gives the same illumination as a conventional 60w light-bulb. a typical light-bulb is used on average for five hours a day, how much energy is saved per year by one light-bulb? 2. if each household used eight such light-bulbs, and there are 20 mi- lion households in a country, how much energy would that country save annually?

Calculate the amount of heat produced when 18000 coulombs of charge is transferred in one hour through a potential difference of 50v

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Avoltaic cell converts chemical energy to