Light bulbs transform electrical energy to light energy. no energy transformation is 100%. thus, in the transfer from electrical energy to light energy, some energy is dissipated as heat. the efficiency of an electrical device depends on: 1. how much energy is wasted ‐ transferred to unwanted stores 2. how much energy is transferred to useful stores the more energy a device wastes, the less efficient it is. the graph shows the efficiency of three types of light bulbs: incandescent, fluorescent, and led. what can you conclude about the energy efficiency of the light bulbs?

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

How does the entropy of steam compare to the entropy of ice?

Isobars are lines of constant or equal pressure on a weather map. they can be used to find areas of low or high pressure over a broad area, and they can tell us how intense the system may be. on weather maps, you may have noticed areas that have a large l or h over a region with lines circling around them. the l stands for low pressure and h stands for high pressure. the lines circling them are isobars. check out the pressure system and isobars over georgia and florida. what is the present weather in this area ? a) clear and sunny b) cold and cloudy c) changing weather d) lots of precipitation