How much does the light bulb consume?

Today, when the question of the cost of energy resourcesis becoming more acute, a growing number of people are starting to ask questions about their savings. It's no secret that the electricity consumption for lighting is 30-50% of the total electricity consumption of the apartment. To find out how much a bulb consumes per hour, it is necessary to multiply the nominal power of a light bulb by the utilization factor. For incandescent lamps it is equal to 0,8 - 0,9. Those. if the power of the light bulb is 80 W, then per hour it consumes 80х0.9 = 72 W. Fluorescent lamps have a utilization factor of 0.8. The calculation of hourly electricity consumption is similar. Everyone can calculate how many kilowatt hours he burns, forgetting to turn off the light in the toilet, bathroom, kitchen. And turning off the light on the corridor, when the whole family is sitting in the hall, and watching the film for two hours, is not even put in question. And this is all money.

Energy saving

Today, more and more popularity is gainingcalled energy-saving light bulbs, which, with the same light flux, consume 5 times less electricity. So a 75 W incandescent bulb replaces an energy-saving 15 Watt bulb. Calculate how much a bulb consumes energy by the above example. The utilization factor is 0.8. The calculation of savings is based on the difference in nominal capacity, for example for this case, the hourly savings are:

75х0.9 - 15х0.8 = 55.5 Tues.

But, the most important source of energy savings is rationality in use. After all, the main question is not how many watts a light bulb consumes, but how many hours it burns in vain.