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What is the energy consumed by an electric lamp of 80W in 8 hours in joules?
Wiki User
∙ 12y ago
80W * 8 hrs
= 80W *(8*60*60)sec
=2304000 J
=2304 kJ
SOME MORE INFO ABOUT HOW TO SOLVE THE PROBLEM:
A watt measures power, which is a rate: how much energy is used in a given amount of time. 1W = 1 J/s. To think about how to calculate the energy used by a lamp burning energy at the rate of 80W, in 8 hours, it might be helpful to think of analogies to more familiar rates
Take pay rate. I take a job at a pay rate of $9 per hour. If I work for 8 hours, I'll have made $9 the first hour, $18 at the end of the second hour, etc. Or $9/h * 8h = $72.
If I walk at a rate of 4 mile per hour, and I walk for 15 minutes, I'll have walked for 4mi/h * 15 min * (1h/60min) = 4 mi/h * 0.25h = 1 mi.
So to find out how much energy is used, multiply the power (energy rate) by the amount of time the lamp is on, by the number of hours in a second (or divide by the number of seconds in an hour).
Wiki User
∙ 12y ago
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How do you convert amps to amp hours?
volts times amps equals watts, a measure of power. Amps times hours equals amp-hours, a measure of electric charge. Electric charge times voltage is energy. So 120 volts at 10 amps for 4 hours would pass 40 amp-hours of charge, the power would be 1200 watts and the energy would be 4800 watt-hours or 4.8 kilowatt-hours. So volts times amp-hours equals energy in watt-hours.
How does an electric power company calculate electrical energy from electric power?
Electricity consumption is measured in Kilowatt hours, this is one unit of electric consumption and charged according to your supplier. You have to know how many watts your devices consume. This is sometimes written on the ID tag or plate, or you can use a meter in line. Multiply this wattage number by the hours it is switched on and this will tell you how much it has consumed. e.g. A toaster may consume 1000Watts = 1Kw, if you ran it continuously for an hour it would consume 1 unit of electricity. Toasters don't run for more than a few minutes, so would use less than 1 unit per operation. 3 mins = 0.05hrs Therefore = 0.05 of a unit. A 100W light bulb would consume 1 unit in ten hours. 100W = 0.1 KW. = one tenth of a kilowatt, so ten times this would equal 1 Kw/h, Therefore ten hours.
19 An electric heating element is connected to a 110 V circuit and a current of 3.2 A is flowing through the element How much energy is used up during a period of 5 hours by the element?
1,760Wh
Electric utility companies charge customers for what?
Kilowatt hours.
What is the formula to calculate the amount of electrical energy consumed in kilowatt-hour?
You don't need to - the "unit" by which electricity is sold is the kWh.kWh = unit1 kWh = 1 uniteach unit is equal to 1000 watt-hours.CommentThe term, 'unit', is short for 'Board of Trade Unit'. The Board of Trade used to regulate the cost of electricity in Britain.
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 is energy-consumed when power240watt and time10hrs?
Convert the hours to seconds. 1 watt is 1 joule/second, so the energy (in joules) is simply the power (in watts) x the time (in seconds).
How much energy is consumed by an 80w appliance over 1 hour?
Energy = power x time. Convert the numbers into compatible units, and multiply. If you multiply watts x seconds, the answer will be in joules. If you multiply kilowatts x hours, the answer will be in kilowatt-hours.
What is SI and commercial unit of energy?
The SI unit of energy is Joules The commercial unit of energy is KiloWaltHour(KWh) The relationship between SI unit and commercial unit is: 1 KWh=3.6*106J (or 3600000 J) One KiloWaltHour is: 1kWh = 1kW * 1h And the definition for kWh is: 1kWh is the electric energy consumed by an appliance of power 1 whenit is used for one hour
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)
What is the power consumed by 40W bulb in a day?
40 W is the power in this case. Whether you have it on a second, or 24 hours, the power will always be 40 W. Now, if it is actually the energy you want to calculate, multiply the power by the time to get the energy. In units: watts x seconds = joules or: kilowatts x hours = kWh
How kilowatt hours affect your electric bill?
The energy accumulated by your electric meter represents the number of kilo-watt-hours (kWh) you consume. We pay for energy on a tiered scale, and the cost per kWh consumed monthly up to -- say 600 kWh -- is typically low and in the range of 8-12 cents per kWh. Energy consumed above 600 will carry a higher price, like 20 cents per kWh. There may even a third tier at say, 30 cents per kWh for energy consumed above 2000 kWh. Depending on where you live, you may expect the kWh you consume to affect your electric bill in a similar manner.
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:
An electric heating element is connected to a 110 V circuit and a current of 3.2 A is flowing through the element How much energy is used up during a period of 5 hours by the element?
If an electric heating element is connected to a 110 volt circuit and a current of 3.2 amp is flowing through the element, 63.36 million joules of energy is used up during a period of 5 hours. This is also 1.76 kilowatt-hours.110V times 3.2A equals 352 watts (joules per second).352 watts times 3600 seconds per hour times 5 hours equals 63,360,000 joules.
What is one source of energy you consumed in the past 24 hours?
Sleeping resting
Electric energy usage on your electric bill is measured in?
Kilowatt hours.
How much electricity does a 60 watt bulb use per hour?
"Kilowatt" is a rate of using energy. It's not an amount of anything.A 60-watt bulb uses energy at the rate of 60 watts ... the same as 0.06 kilowatts.In one hour, it uses 60 watt-hours of energy ... the same as 0.06 kilowatt-hours.
