Alternative fuels > Straight Vegetable Oil
WVO preheater
buickanddeere:
--- Quote from: ronmar on February 15, 2014, 08:03:58 PM --- You take a 120VAC(pk-pk voltage) sine wave, half of the sine wave goes positive and half of the sine wave goes negative. If you run it thru a diode, you block say the negative going half of the signal. This leaves you with a positive going 60V half wave with spaces between where the negative going half cycles used to be(50% duty cycle).
Now if you are starting with a 240VAC signal, then you would be left with 120V half cycles with spaces between where the missing cycles should be(50% duty cycle). Still about 25% of the power delivered by the full 240VAC waveform.
But I thought we were discussing a 1400W 120V heating element...
--- End quote ---
Don't know where you went to school for electrical theory?
With a diode the applied power is now with one half of the entire sine wave. Measuring either and only the positive or negative portion of the complete sine wave.
With 120V rms AC power through a diode. Between 0 and 180 degrees there will be for example a positive half of the sine wave. With a 170 volt peak. Then virtually nothing from 180 to 360 degrees.
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