Many airplane builders were never fortunate to have even basic
electronics and often basic electrical issues / questions will be as
challenging as brain surgery would be to all of us. I'll throw out a
very simple way for you to answer many questions you have in your KR or
you home or shop.
Jot down this basic formula and stick it in your wallet or paste it on
the back side of your contact lenses. If you've never had basic
algebra, ask you kid or grand kid to show you how to use any two to
determine the third.
P=power in watts
I=current in amps
E=voltage
P = I x E Knowing any two will give you the third. so I = P/E,
E =P/I This works for AC or DC electrical circuits.
P (power in watts) = I (current in amps) X E (voltage). If you know the
voltage and current you can determine the power
I (current) = P (watts) / E (voltage) If you know the power and voltage
you can determine the current
E (voltage = P (watts) / I (current) If you know the power and current
you can determine the voltage
Example: a 100 watt landing light (incandescent ) on a 12 volt battery
will pull 8.33 amps (P (watts) / E (volts) = I (current) Now you know
the wire size and breaker size to use.
Example: your radio transmitting at 5 watts pulls .42 amps just to
transmit. P (watts) / E (volts) = I (current)
Example: a 100 watt bulb in you home will pull .87 amps (P (watts) 100
divided by E (voltage) 115 volts = I current .87 amps
Lesson 2: The greater the voltage or current the brighter the sparks ! 😮
Larry Flesner
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