'Speed' is only one of the factors that determine the output voltage of an a.c. generator, so your question cannot be answered. In practise, speed is more important establishing frequency rather than voltage.
A 50 Hz alternator runs at 3000 rpm.
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In North America a 4 pole 60 Hz standby generator operates at 1800 RPM. This speed is used for generators in the 25 kW to 2000 kW range.
If it is AC then you don't need a formula, you just need a transformer.
I found this light http://www.ecolivingcentre.com.au/products-page/?product_id=23 and it is the perfect size and power for a torch we are making in graphics, the only problem is that it runs on 240 volt ac current and the torch im going to make is going to have a 12 volt dc lead acid battery, is there any way that you can make the battery work with this light
An ac generator produces ac, a dc generator produces dc, it all depends on the generator.
Alternator and ac generator is equal
You step down voltage from an AC generator with a transformer.You step down frequency from an AC generator with a motor/generator set, or with an inverter. This is not a common thing to do.
no
240 amps AC
This depends on the size of the generator itself. The smaller the generator, the more RPM's will be needed to generate 200 volts in an A/C system.
Start the generator and check the voltage output at the receptacles on the generator with an AC volt meter.
Depending on the type of generator, you can measure the voltage at the output. Assuming it's a regular 120 volt AC generator, the output should measure 120V AC. If it doesn't, you may have problems.
In the US the voltage is about 220 volts. This voltage is based upon the average voltage of the AC sine wave. It can peak as high as 240 volts or as low as 210 volts. So these different voltages are actually referring to an average 220 volt system.
The formula for RPM is, RPM = Hz x 60 x 2/# of poles the motor has. To answer this question more information needs to be stated.
It shouldn't damage the equipment. But it will probably not work properly.
If it is AC then you don't need a formula, you just need a transformer.
You wouldn't. Terminology wrong? An alternator is a generator that generates AC.
There are several ways to convert a 240 volt input to a 1.5 volt output. If the 240 volt input is alternating current (AC), a simple transformer can reduce the 240 volts to 1.5 volts (AC). A properly configured resistor or impedance coil in series with the input and output would also do the job but a tansformer also serves to isolate the output from the input offering greater protection for the 1.5 volt device. You If 1.5 volts direct current (DC) is required, a rectifier circuit is needed after the 1.5 volt AC output. If the source is 240 volts (DC), A resistance circuit in series can reduce the output voltage. You can also use electronic circuitry to chop of the 1.5 volts.
I found this light http://www.ecolivingcentre.com.au/products-page/?product_id=23 and it is the perfect size and power for a torch we are making in graphics, the only problem is that it runs on 240 volt ac current and the torch im going to make is going to have a 12 volt dc lead acid battery, is there any way that you can make the battery work with this light