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1 kilocalorie = 4186.8 joules, and 1 joule/sec = 1 watt. So 1 kwh = 1000 x 3600 watt.secs = 3.6 x 106 joules. So answer = 4186.8/(3.6 x 106) = 1.163 x 10-3 kwh. This could also be expressed as 4.2 kwsec
You could check this directly using an electric kettle. Put in 1 liter of water (1 Kilocalorie will heat this by 1 deg celsius) Note the kettle wattage, and the cold water temperature, then note how many seconds to reach boiling temp (100 celsius). The number of kilocalories is just the temperature rise in degrees C, the number of Kwseconds is the wattage times the time to reach boiling in seconds.
Wiki User
∙ 15y ago
Wiki User
∙ 15y agoThe overall efficiency for thermal power plants using the Rankine cycle ranges from about 40 percent for modern coal fired plants down to about 33 percent for light water nuclear reactors, chiefly because the steam temperature at turbine inlet is much lower for nuclear plants (PWR and BWR). If we take 33 percent, this means that to produce 1 kWh at the generator the thermal input must be about 3 kWh. Now 1kW = 1000 watts = 1000 Joules/sec = 238 calories/sec (1 calorie = 4.2 Joules), so 3 kW = 714.3 calories/sec. Therefore in 1 hour = 3600 seconds, the heat energy input is 714.3 x 3600 calories or 2571.4 kilocalories.
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How many joules is 1 kWh equal to?
1 kwh = 3,600,000 Joules
How many kilowatt hours - KWh - are used to light a 30 watt light bulb for 1 hour?
A kilowatt is 1,000 Watts. 30 Watts is equal to 0.03 kilowatts. A kWh or kilowatt-hour is the rate of electrical usage. It is a measure of kilowatts used per period of time (1 hour). 1 kWh is 1 kilowatt (1,000 watts) for 1 hour. So, multiply your 30 watts (0.03 kilowatts) by 1 hour to get kWh. =0.03 kWh In about 33 hours and 20 minutes, this lamp would use 1 kWh.
How many joules of energy is there in kwh of energy?
1 joule = 1 ws (watt-second); since 1 kw = 1000 w, and 1 h = 3600 seconds, it follows that 1 kwh = 3,600,000 ws or joule.
How much CO2 will be produced for every kwh?
1 kWh creates approximately 1 kg of CO2 from a black coal fired power station.
How many joules are in a kWh?
1 kWh = 1,000 watt-hour1 watt = 1 joule per second1 hour = 3,600 seconds(1,000 watt-hour) = (1,000 joule/second) x (3,600 second/hour) = 3,600,000 joules
How many joules is 1 kWh equal to?
1 kwh = 3,600,000 Joules
How many kwh is mwh?
1 mwh = 1000 kwh hence 4 mwh = 4000 kwh
How many kWH in a PJ?
1 PJ equals 277 777 777.78 kWh
How many KWH is in 1 GJ?
Hi I believe it is 277.7 kWh per Gj. Cheers
How many watts are in a kwh?
A 1000 watt device operated continusouly for 1 hour would equal 1 Kwh.
How many Kwh to raise 1 l water 1 degree c?
0.001167 kWh/°C/l at 100% efficiency.
How many KWH equal a meg awatt?
1
How many kwh are in a kw?
If you have a device of 1 KW, if this device work during an hour, this device will consume 1 KWH. If the device works during 15 min, it will consume 1KW(15 min/60 min)= 1(1/4)= .25 KWH. That is you will obtain(get?) KWH on the following way: KWH = time in hours X KW
How many kWh in a MWh?
1 Mwh = 1000 Kwr
927.7 million kWh to gwh?
1 million kWh = 1 GWh, so 927.7 million kWh = 927.7 GWh.
How many kilowatt hours - KWh - are used to light a 30 watt light bulb for 1 hour?
A kilowatt is 1,000 Watts. 30 Watts is equal to 0.03 kilowatts. A kWh or kilowatt-hour is the rate of electrical usage. It is a measure of kilowatts used per period of time (1 hour). 1 kWh is 1 kilowatt (1,000 watts) for 1 hour. So, multiply your 30 watts (0.03 kilowatts) by 1 hour to get kWh. =0.03 kWh In about 33 hours and 20 minutes, this lamp would use 1 kWh.
What is daily kWh output of 1kW solar power system?
If it's a 1 kW system, it means that it can deliver 1 kW at any given time. How many kWh you get out of it depends on how many hours of good sunlight you get. 10 hours of good sun = 10 kWh. 10 hours of half light, 5 kWh (kilowatt hours).
