What is the approximate percentage of electrical energy converted to light energy in an incandescent bulb?

Answer 1

A typical light bulb wastes 90 percent of electricity. According to the EPD, the typical incandescent light bulb turns only about 10 percent of its electricity into light. A typical light bulb, when on, is hot. That's because 90 percent of the energy is wasted as heat, which means it isn't very energy-efficient. A typical light bulb wastes 90 percent of electricity. According to the EPD, the typical incandescent light bulb turns only about 10 percent of its electricity into light. A typical light bulb, when on, is hot. That's because 90 percent of the energy is wasted as heat, which means it isn't very energy-efficient.

Answer 2

Look at the power rating stamped on it. If it says 100W it will use 100WattHours ,(ie 0.1KWH) every hour.

Think of 100 watts as being 100 Watthours per Hour. etc. You pay your electric bill according to how many KWH you use, (not KW, or Watts)

Answer 3

Most of it. Normal incandescent (filament) bulbs are 1-3% efficient (97% to 99% of energy is wasted as heat), halogen incandescent are slightly better at 2-3.5% (some short-life projector bulbs are 5%), fluorescent and LED lamps are 3-6 times better than incandescent: compact fluorescent are 8-12%, T8 linear fluorescent tubes with high efficiency electronic ballast are 12-15% (traditional magnet ballast systems are lower at 8-10%), and LED lamps can go as high as 22% but are usually in the range 9-15%.

Answer 4

Incandescent bulbs have been described as electric space heaters that give off

some light. They are less efficient than several other modern types of light bulbs,

with most varieties converting less than 10% of the energy they use into visible

light, with the remaining energy being dissipated as heat.

Some applications of the incandescent bulb deliberately use the heat generated

by the filament. Such applications include incubators, brooding boxes for poultry,

heat lights for reptile tanks, infrared heating for industrial heating and drying

processes, and the Easy-Bake Oven toy. But waste heat can also significantly

increase the energy required by a building's air conditioning system.

Answer 5

85% light and 15% heat it is much more efficient than incandescents

Answer 6

It is marked on the bulb, and can be anything from fractional-Watt in a torch, to 150W for a mains lamp. Most of the power is dissipated in heat, not light!

Answer 7

120 volts

Answer 8

About 30%.