Originally Posted by def
So, you're gonna argue with an engineer?
The Watt is a unit of work.
The volt is the force or EMF and the ampere is the unit of electrical current.
When the load consumes more current than the system is delivering (alternator), the battery supplies the difference. When this happens in the typical automotive electrical system, the voltage is reduced unless the alternator delivers more current (amperes) to offset the loss.
So, when the lights dim, it is due to more current (amperes) being called for than is being delivered.
Don't start with the Engineer stuff. I work with them all the time. I am a certified Industrial Electrician.
Pissing contests achieve nothing.
The only way current will flow out of the alternator is if its output voltage is higher than the battery voltage.
So the term watts is not incorrect