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An electrical fire is rated 230 V 3 kW How many joules of energy are transformed in two hours?
Wiki User
∙ 14y ago
3 kilowatts means 3,000 joules per second.
Two hours = 7,200 seconds.
3 kilowatts for two hours = (3,000 x 7,200) = 21,600,000 joules.
We don't understand the part about "fire", and we don't need the part about the voltage. These are
leftover parts; we'll drop them into the bottom of our toolbox when nobody is looking.
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoJ= 2*10^3 J/sec * 3600 sec/hr * 3 hrs = 21.6 million Joules
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What does 40 watts bulb mean?
An electrical watt is a measure of power. A 40 watt light bulb uses 40 watts of electrical power. It has a relative measure of twice the light output of a 20 watt bulb and one half the output of an 80 watt bulb. A 40 watt bulb uses 40 Joules of energy each second, or 40 watt-hours of energy each hour. In 1000 hours it uses 40 kilowatt-hours or Units of electrical energy.
What is electrical energy measured in?
Kilowatt-Hours
Three 60 watt buibs were burned for 200 hours each find kilowatt hours and electrical energy consumed in certain home?
Energy in KWh = 60 x 200 = 12,000 KWh Energy in Joules = (12000 x 10^3) / (60 x 60) = 3333.33 J (Since J=W/s)
How much power does a 60 watt fluorescent bulb use?
First of all, lamps (or any other electrical appliance, come to that) don't 'use' power.'Power' simply tells you the rate at which your lamp consumes energy. A 60- W lamp is using energy at the rate of 60 joules per second -i.e. for every second the lamp is on, it is consuming 60 joules of energy. This is because one watt is equivalent to one joule per second.To complicate matters, however, your electricity company measures the energy purchased by you, not in joules (or kilojoules or megajoules, etc.), but in a special unit called the 'kilowatt hour' -which is equivalent to 3.6 megajoules.To find out how much energy your lamp is using, in kilowatt hours, you must multiply its rating (in kilowatts) by the amount of time it is operating (in hours). So if, for example, your 60-W lamp runs for, say, four hours, then the energy consumed would be (60/1000) x 4 = 0.24 kilowatt hours. From this, you can work out the cost of running your lamp, by mulitplying the number of kilowatt hours by the amount your electricity company charges per kilowatt hour.
How is joule watt watt-sec kilowatt-hr related?
The Joule is the unit of energy (how much work is done?), and the Watt is the unit of power (how quickly is the work done?) Power is the RATE at which energy is used. If a load draws one watt of power from the source, it consumes one Joule of energy every second, so a Joule is the same as a Watt-second. The Watt-second is an old unit for measuring energy, and has been replaced by the Joule, which is now the internationally accepted unit of energy. A 1000 Watt heater uses 1000 Joules of energy every second, and that's (1000w x 60minutes x 60seconds) Joules of energy per hour, or 3,600,000 Joules (3,600 kilo-Joules or 3.6 Mega-Joules). A 100 Watt light bulb that's turned on for 10 hours will use the same amount of energy, (100w x 10h x 60m x 60s) but it uses it at 1/10th of the rate. It has a lower power, so it uses less energy per second. In both of the examples above, though, the same energy has been used despite the different powers, because the product of power x time is the same. Fairly obviously, the Joule and the obsolete Watt-second are not big units of energy. If you got your energy bill in Joules there would be LOTS of zeros on it, so suppliers use Mega-Joules as their unit for cooking gas billing. Electrical energy is measured in kilowatt-hours, where one kilowatt hour is 3.6 Mega-Joules, or 3,600,000 Watt seconds of energy.
Electrical potential energy?
Electrical potential energy is the energy associated with the magnitudes of the charges on electrically charged particles and the positions of the particles relative to one another. The closer two particles with the same charge are, the greater the potential energy. Therefore, the particles have the greatest electrical potential energy at position 1. Electrical potential energy is similar to gravitational potential energy. Both energies exist because the relative positions of two objects give the objects the ability to do work.
How many joules of energy is consumed if the electrical meter shows 400 units of energy?
The electric meter uses kWh (kilowatt x hours) as units; a Joule is a watt x second. Therefore, a kWh has 3.6 million joules. Just multiply by this number.
What does 40 watts bulb mean?
An electrical watt is a measure of power. A 40 watt light bulb uses 40 watts of electrical power. It has a relative measure of twice the light output of a 20 watt bulb and one half the output of an 80 watt bulb. A 40 watt bulb uses 40 Joules of energy each second, or 40 watt-hours of energy each hour. In 1000 hours it uses 40 kilowatt-hours or Units of electrical energy.
How many joules in a liter of petrol?
A gallon of gasoline contains about 132x106 joules of energy, which is equivalent to 125,000 BTU or 36,650 watt-hours:
What is electrical energy measured in?
Kilowatt-Hours
Three 60 watt buibs were burned for 200 hours each find kilowatt hours and electrical energy consumed in certain home?
Energy in KWh = 60 x 200 = 12,000 KWh Energy in Joules = (12000 x 10^3) / (60 x 60) = 3333.33 J (Since J=W/s)
How much energy can be created from a generator with 100 pounds of force?
The technically correct answer is none. no energy will be created or destroyed, only converted from one type to another. Kinetic energy from a 100 lbs force can be transformed into electrical energy using a generator, however. 100 lbs of force is equivalent to ~445 Newtons, or 445 Joules/meter. So, if a 100lbs force is applied over 1 meter to a generator, it can, at most, produce 445 joules of electricity. The actual produced energy will depend on the efficiency of the generator, and any other losses between the measurement of the 100 lbs of force to the generator. 1 Joule is equivalent to 1 watt second. 445 joules is equivalent to 445 watt seconds, or ~124 milliwatt hours (if you want to relate it to your electric meter).
How do you compute electrical energy consumption?
Usually in Kilowatts hours.
Conert 365 kilo watt hours to joules?
365 kilowatt-hours is 1,314,000,000 joules.
What is the unit used in measuring thermal energy?
The customary unit is called the Btu, or British thermal unit. The metric unit is the joule. The joule is the standard metric unit for measuring any type of energy, including heat.
How is electrical measured?
Electricity is measured in watts, volts, amps and joules. Energy use : watt-hours, kilowatt-hours Power (rate): watts, joules Voltage: volts Current: amperes
How much energy is 1 Megawatt?
First of all, a megawatt is not a unit of energy. It is a unit of power, or the rate at which energy is used. 1 watt corresponds to 1 joule per second. For example, a sixty watt lightbulb uses 60 joules of energy per second. So a megawatt is one million watts, or one million joules of energy per second. Electrical energy is often measured in kilowatt-hours by the electric company (So that they know how much to charge you). This is equivalent to the amount of energy that a kilowatt power source could supply in one hour. The amount of energy in joules that a kilowatt hour is goes as follows: 1 kilowatt = 1000 watts, so 1000 joules per second. Multiply this by the number of seconds in an hour, and you have 3600000J.
