byoungplumbing(at)gmail.c
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 Posted: Thu May 25, 2017 6:49 am Post subject: Re is 12 v 12 volts |
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This is a lot of rambling. Just hit delete if your not interested
Do not archive
12 v is 12 volts end of statement! That is a standard. The amount of power to push 1 amp through a 12 ohm resistor
It is what we perceive to be 12 volts may or may not be 12 v.
Our aircraft while running will put out anywhere from 10 to 35 volts ac. Some equipment will run on ac. Most needs DC. In order to convert ac to DC we need some type of rectifier. The most simple is a single diode. Which will provide pulsating DC. If we use 4 diodes we get a full bridge rectifier. It still provides pulsating DC but with twice the energy. By adding a capasitor the pulsating DC becomes a rippled DC. Adding a battery smooths it out even more. Depending on the frequency the addition of an inductor may also help. Tmi too much information
A 12 v ac circuit will push 1 amp through a 12 ohm resistor. BUT if you look at it with a peak to peak ac meter, or an oscilloscope it will show 14 1/2 volts plus or minus but on an rms (root mean squared) meter it will show 12v. To get the average 12 volts out of 14 1/2 volts, the top of the voltage curve is clipped off and used to fill in the gaps see the red and blue in last illustration.
Now if you need 50 amps on a momentary basis. You can do it with a 1/2 amp supply. Provided you have a storage unit to put it till needed. Ever heard of a battery? The size of battery is determined by the amp draw required and the duration it is needed. If amp draw and duration are high,, a larger power supply is needed. If we have too small of battery or wire and need 50 amps the voltage will crash to near 0, or we will burn something up in the process. Example,, a fuze will kill the power and prevent a fire.
Did I mention that our planes generate around 35 vac well we use 12 and burn the rest up as heat. Thus the purpose of the heat sink on the regulator. Did I say we use 12??? Silly me, the voltage regulator clamps off at 13.8 to 14 v DC.. this allows us to charge a 12 v battery which when fully charged runs about 12.8 volts...
So 12 volts is exactly 12 volts,,, what we preciece to be 12 volts is well close to 12 v.
Boyd Young
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