Earth Sciences
Energy

# How much joules is needed to run a 60 watt light bulb for 3 seconds?

123 ###### 2009-06-04 02:26:18

1 Watt means 1 Joule per second, so 60 watts means 60 Joules per second. A light bulb that burns energy at that rate for 3 seconds uses 180 Joules.

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## Related Questions there are 100 joules in an energy efficient light bulb 75 joules go towards the light and 25 joules go towards the heat  Power = energy / time, in SI units: watts = joules / seconds. Solving for energy: Joules = watts x seconds. Joules = watts x seconds. Just convert the minutes to seconds, then multiply.  A Watt is a Joule per second. Joules measure energy and Watts measure power, which is the rate of energy used. Therefore, if you use a 60 Watt light bulb for 10 seconds, you consume 600 Joules. Watt means joules/second. It refers to the amount of energy a device uses, in this case. Multiply the power (in watts) by the time (in seconds) to get the energy (in joules). Let's assume that this is an incandescent bulb with a light efficiency of 35 percent ... i.e. 35 percent of the electric power it consumes is converted to light, and the other 65 percent becomes heat, which the bulb then dissipates into the room. So the bulb is dissipating heat at the rate of (0.65 x 40) = 26 watts = 26 Joules per second. 2 hours = (2 x 3,600) = 7,200 seconds 26 joules per second x 7,200 seconds = 187,200 Joules of heat 60 watts = 60 joules per second5,400 joules = (5,400 / 60) = 90 seconds, at the rate of 60 wattsBut we must disagree with the language of the question.At the rate of 60 watts, it takes 90 seconds to use 5,400 joules of energy. But no work is done.The energy is converted into electromagnetic energy, in the form of heat and light, and it'scarried away from the light bulb by the E&M radiation. 100 watts running for 60 seconds uses 100 x 60 Joules of energy. A Joule is the same as a watt-second. It's 100 watts times 3600 seconds, that's 360,000 joules of energy. A joule is 1 watt for 1 second. To find the energy in Joules you multiply power in Watts by time in seconds. So the sum is 60 watts x 36,000 seconds, or 2,160,000 Joules Almost 90 % of electrical energy provided to an incandescent light bulb goes as heat and rest as light. A 100 Watt bulb puts out 100 Joules of heat per second. So - for one minute it would put out 6000 Joules (100 Watts X 60 seconds). 1 BTU (British Thermal Unit) of heat = 1055.056 Joules. So a 100 watt bulb, burning for one minute would put out 5.68 BTUs of heat. ( 6000 Joules / 1055.056 Joules) = 5.68 BTUs. Same bulb burning for one hour would generate 341 BTUs of heat. That would be 40x60 watt-seconds, also known as Joules, so it's 2400 Joules of energy. 3.6 MegaJoules is equal to one kilowatt-hour, also known as 1 unit. If you weigh 70 kg and the stairs are 3 metres high, the energy needed is 70 x 9.8 x 3 Joules or 2058 joules. That would keep a 60 w bulb going for 2058/60 seconds, or 34.3 seconds. But to produce that same energy in a generating plant, the fuel energy wasted in the process would be between 2000 joules for a gas plant of 50% efficiency, and 6000 joules for a coal plant of 25% efficiency.  60 watt seconds x 1 hr / 3600 seconds = 1/60 watt hours = 60 joulesAnswerSince power is the rate of doing work, i.e. P = W/t, thenW = P t = 60 x (1 x 60) =3600 J(where:W = work done, expressed in joulesP = power, expressed in wattst = time, expressed in seconds) Every second a 150 Watt bulb converts 150 Joules from electricity into heat and light. The number of Watts tells you how many Joules pass per second. The energy is 100 watts times 60 seconds: 6000 watt-seconds, also called Joules. Most of the energy is emitted as heat. 100 watts means 100 Joules/Second. So in 24 hours, the bulb would use 24*60*60*100 Joules. so that's 8,640,000 joules Power = Energy/time 100W=Energy/360 Seconds Energy = 100/360 Energy &asymp; 0.27 Joules That depends on the power used by each light bulb. Look at the specifications for a specific light bulb, then multiply the power by 10. Note that energy = power x time; that is to say, the energy spent by a light bulb depends on its power, but also on how long you keep it on. Specifically, watts = joules x seconds. 1 Joule = 1 Watt.sec, ie 1 Watt for 1 second. A 75 Watt bulb dissipates 75 Joules every second, so the answer is 10/75 of a second = 0.1333 seconds first you have to conver 4.3 hours into seconds, which is 15480seconds and then you multiply that by the power which is 60 W, which then you get 928800 Joules ###### Home ElectricityEnergyPhysicsGeneral and Special RelativityElectricity and MagnetismScienceLight Bulbs and Artificial Lighting Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.