Archive for February, 2011


Do watts from a generator add up?


So I'm sort of new to this project I'm doing. I made a miniature hydro-electric generator a few days ago, and to test it, I've just spun it as fast as possible by hand. It made 1 Volt, and the wire I used tested for 15 Ohms of resistance. Using Ohm's Law, I calculated about .06667 Amperes, and from that, I got .06667 Watts. So since I'm new to this, I was wondering, does this mean that it's like, .06667 Watts per second, or am I misunderstanding the definition of Watt?

Also, if I haven't misunderstood (which is doubtful), does this mean that after approx. 4.16 hours, I'd have made 1 kiloWatt?

[4.16 gotten by taking 1000 watts/1kW, divide by .06667 watts/1 second (not sure if the "second" part is right), take that, and divide by 3600 seconds/1hour]

so once again, that formula probably isn't right, but any help is appreciated.

Thank you very much.

-Foralis

The power is

P = V x I = volts x amprs = watts

P = 1 x 0.6667 = 0.6667 watts

The energy is:

E = P x Time

The time is in seconds or in hours, but not used 3600 seconds to converts. There are per definition.

E = P x Time = watts x hour = watts-Hour

E = 0,6667 x 4,16 = 2.77 watts-Hour

E = [ 2,77 / 1000 ], KWh = Kilowatts-Hour

E = 0,0028 KWh

We can create AC from DC - the best example is House hold Inverters. We can inturn create DC from AC- Best example is mobile phone charger producing 15 v for ex. So why cant we generate Continuous AC for our house hold equipments and loop the same power needed for generating AC. Just we can loop back DC and generate AC. We have optimum power booster circuits which requires little power to run and boost the input voltage to a max level. Then we can convert to AC again. A little AC can be used to generate DC as a back loop input. So we can get a continous source of electricity for the whole house. Why cant any scientist do this? I am from electronics and comm engineer. But i cant design a machine. But why cant others? We have so many scientist in this world. WHy nobody tried it? Now if you think we cant get power from nothing then we can run a generator with fuel to give initial power. So now u got power. Lets boost it and links the loops as i said earlier. Why is it not possible?

Power is the rate of transfer of energy. When power is produced, energy is continuously converted from one form and delivered in another. In the case of conventionally produced electrical power, something is burned to convert the chemical energy that it contains to heat, a form of energy. The heat is then used to operate an engine that converts the heat energy to mechanical energy in the form of a turning shaft that can transmit torque. The mechanical energy is then used to turn a generator that converts the mechanical energy to electrical energy consisting of a voltage pushing an electrical current through a wire. As long as the current continues to flow, it transmits energy that is ultimately used to perform work.

The flow of energy is a continuous process. Energy can not be created from nothing to keep it flowing there must be a continuous input.

In the case of nuclear fission energy, some mass is converted to energy when an atom is split. Energy = mass X speed of light squared.

what would be the loss in output VA rating of a petrol engine generator if its used with Natural Gas by installing a gas kit ?

I heard that Natural gas is not a perfect fuel for the generators ........ so there would be a loss or lesser VA output would i get .......... but its an approximation ..............

i want to know if theres an exact measurement or any formula ......

i hard that 2 KVA generator would give 1500 to 1600 VA output with natural gas ........... means it can run 1500 VA to 1600 VA load and thats a full load condition.

what would be the power factor of a 2 KVA generator ? And, how can i measure the PF of it ?

thanks

An equivalent volume of natural gas supplies about 80% of the energy of gasoline. However unless the engine were running at full throttle which is highly unlikely, any lost power would be negligible. Typically the engine will compensate by opening the throttle further to maintain proper speed.

Power factor is a function of the load, not the generator. The generator can supply a certain amount of current to the load. In a reactive load, not all the current can be used to create power. In a non reactive load 1 watt is the same as 1VA. In a reactive load 1VA will be less than 1W. Measuring power factor can not be done with a simple voltmeter and ammeter. You need to measure the phase difference between the two and calculate from there. There are power monitors which will display power factor of the load. A properly rated AC capacitor can be placed in parallel with the load to maximize power available.

http://ezinearticles.com/?The-Relative-Efficiency-of-Gasoline,-Natural-Gas,-and-Propane-Fuels-For-Back-Up-Generators&id=2991047

Gasoline 1 gallon = 125,000 BTUs
Natural Gas 1 CCF = 100,015 BTUs (CCF=100 cubic feet)
Propane 1 gallon = 91,700 BTUs
You can see from above that 1 gallon of gasoline is more efficient than 100 cubic feet of natural gas or 1 gallon or propane. In fact, the ratio is approximately:

1 gasoline = 1.25 CCF natural gas = 1.36 gallons propane
In other words, you would need 1.36 gallons of propane to produce the equivalent BTUs of 1 gallon of gasoline; or, 1.25 CCF of natural gas.

I am planning to purchase a portable electric generator, and would like to know how to convert the known volts and amps that my refrigerator draws to watts that the generator puts out in order to know if the generator that I am buying will handle the load that I am putting on it in an emergency situation..(electric goes out). I am planning to purchase a 1000 watt generator and the refrigerator pulls 110 volts at 6.5 full load amps. I could get another 1000 watt generator for my furnace that pulls 110 volts at 10.8 amps. would a 1000 watt generator handle these loads seperatly? (one 1000 watt generator per load?)

A 1000 watt generator can support a total of 110 volts at 9 amps. The formula is Watts = Volts x Amps. If I were you, I would just purchase one larger generator around 5000 watts. Another idea is to purchase a small bank of solar panels and batteries. Use the panels to charge the batteries for when the power goes out.

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