At a rate of 10 cents per KWH, it will cost $7.89 for the year. This is a fairly simple math problem, but it's a very unrealistic math problem. ... well over 300W or $0.05 per hour of electricity. As an example, a 100-watt light bulb operating for ten hours would use one kilowatt-hour. Energy = (100 × 1) ÷ 1,000 Energy = 100 ÷ 1,000 Energy … Incandescent C7 (2”) light To convert the power in watts to kilowatt-hours, multiply 100 watts by 1 hour, then divide by 1,000 to find the energy usage in kWh. $22.68/month for 7 rooms. Electricity usage is calculated in kilowatt-hours. T12 and Incandescent Light Bulb Energy Usage. A 60W equivalent bulb probably takes about 9 W if its an LED. For example, if you keep a 60-watt incandescent bulb on for an hour, it will burn, well 60 watts. A 100 watt light bulb uses 100 watts of power. For example: let’s predict how much it costs to power a light bulb every hour. Kilowatts (kW) x Hours of Use = Kilowatt Hours (kWh) 4. So the total energy usage for a year is 78.9 KWH. Incandescent light bulbs consume approximately 10 times as much power (although sometimes less). This wattage consumes 0.027 kWh per hour and the 100-watt light bulb cost per hour is less than $0.01. $10.33. CFLs use 1/3rd to 1/5th the electrical power of incandescent lighting and can last 8 to 15 times longer. Light Bulb Efficiency However, the cost in Hawaii is a staggering 26 cents per kilowatt hour. How much does it cost to run a watt light bulb for 1 hour if electricity cost 10 cent per kilowatt-hour? Imagine how much it would cost if you went back to using them! (multiply the figures above by 10). A kilowatt-hour is 1,000 watts used for one hour. Wattage per Bulb. A year is 8766 hours. An average CFL bulb which provides 800 lumens will use only 13 to 15 watts compared to a similar incandescent bulb which uses 60 watts. There are generally three types of light bulbs: A 100 watt light bulb would only use one-tenth of a kWh in one hour. However, that does not mean that it will give you the same amount of light, as another 60-watt bulb. Bulb Type. Contrary to some marketing claims, LED bulbs do indeed generate heat as does anything that consumes electricity. Watts ÷ 1,000 = Kilowatts (kW) 3. Volts x Amps = Watts 2. https://www.wikihow.com/Calculate-Kilowatts-Used-by-Light-Bulbs So, a 100-watt bulb would only cost $0.84 per hour if electricity cost $8.40 per kWh. Therefore, a 40W T12 light bulb would cost an average of 12 cents for every 25 hours of use (25 x 40 equals 1000 watts, which equals 1 kilowatt). $0.12/kWh)* Incandescent mini light.41. How to calculate electric usage cost: 1. This wattage consumes 0.014 kWh per hour and the 60-watt light bulb cost per hour is less than $0.01. $3.24 per month at an electricity rate of $0.45/kWh. A 60-watt incandescent light bulb is the equivalent to a 15-watt LED bulb. A kilowatt hour is defined as the use of 1000 watts of electricity in an hour. Cost of Powering 10, 100-bulb strands (at avg. If you run a 100-watt electrical bulb for 10 hours, you have used 1kWh of energy. 60-watt light bulb. The important thing to keep in mind is that LEDs consume a lot less energy than incandescent or halogen bulbs and are much more efficient in how they use that energy versus traditional bulb types. 40-watt light bulb Different Bulbs Use Different Amounts of Energy.