Home Electricity
Electrical Engineering

How much heat does a 40w bulb generates in an hour?

Top Answer
User Avatar
Wiki User
Answered 2009-10-31 13:49:54

A light bulb has an efficiency of 10%. A 40 watt light bulb gives off 4 watts of light. That leaves 36 watts of heat. Now you can look up the formula to get the conversion factor to joules so you can get the right answer for your homework.

User Avatar

Your Answer

Related Questions

The heating of the wire causes light to be emitted.

The answer depends on the stove and the way in which it generates heat.

it depends what kind of bulb you have in it. how many watts??

That bulb is 100 watts or 0.1 kilowatts so it uses 0.1 kilowatt-hour of energy each hour, which costs about £0.015

The electrical term Watts is a measure of heat. It is calculated by multiplying amps times volts, but it is still a measure of heat. A 50w light bulb made for 12 volts produces about the same amount of heat as a 50w light bulb made for 120 volts.

No. Fixture rating is based on the ability of the fixture to dissipate the heat of a bulb. A 75 watt bulb produces more heat than a 65 watt bulb which will result in too much heat build-up for a fixture designed for the lower wattage. If you MUST use a larger bulb, change the fixture.

The wattage rating of a light bulb is a measure of how much power is dissipated to create the light and heat that radiates from the bulb. Higher wattage means more power is used and that means more energy is radiated as light and heat.

A 1-watt bulb uses 3600 watt-hours every hour, which is 1/1000 of a kilowatt-hour, so the cost is 0.01 cents.

The power rating for a light bulb (like "40 W") tells how much electrical power the light bulb uses. All of the power used by the bulb is either converted into light or heat. In an incandescent bulb, most of the energy becomes heat. In a fluorescent bulb, more of it becomes light.

For a simple experiment all you would need would be a working light bulb and a thermometer. You could also use a yardstick and measure how much heat there is at different distances from the bulb.

The bulb takes a power measured in watts. Each hour it uses energy equal to that number of watts, as watt-hours. A 60 W bulb uses 60 watt-hours in 1 hour, or 600 watt-hours in 10 hours.

Depends upon the wattage rating. A 24 watt bulb will create far less heat energy than a 100 watt bulb.

Copper has much less resistance, so the electricity flows thru it with little heat, where as the tungsten resists the flow and generates heat, that you see as light.

500 watt bulb run for 1 hour = 500 watt/hours or 0.5 kilowatt/hours 0.5 x 24 x 30 = 360 kilowatt/hours 360 x 0.09 = $32.40

DDR3 sdram has the fastes clock but it also consumes the least power and generates much less heat than others. To learn more follow our blog at

Plasma televisions require more light to create screen images, and in turn this generates more heat.

A 100 watt bulb uses 100 watt-hours in one hour. In standard energy units, that is 0.1 kilowatt-hours.

A 100 w light bulb uses one tenth of a kilowatt of power, therefore in 1 hour it uses one tenth of a kilowatt-hour of energy, that is 0.1 units, or 1.5 p.

For a common light bulb, the average person usually can guess by the wattage of the bulb how powerful it will be (more watts means will mean more heat/light). Properly speaking, the "candela" (sometimes called a "candle") is the unit of "luminous intensity" which is often used scientifically to gauge how much light an object generates. Appropriately enough, the average candle emits approximately one candela of luminous energy.

A 60 watt bulb uses 60 joules per second, or 21 kilojoules per hour.

An incandescent light bulb is very inefficient light source because of the amount of heat energy wasted when it is energized.

The energy used each hour is 60 watt-hours.

Copyright ยฉ 2021 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.