Phase
Member
- Location
- Waterdown ontario Canada
Hello,
i tend to over think certain things and complicate matters.
Im going to explain my problem understanding this very basic situation regarding voltage current,resistance, in a resistive circuit and an inductive circuit. Now, I want to keep things very simple, getting into inductive reactance or impedance etc, shouldn’t need to be brought to the table unless completely necessary.
For what ever reason I’ve hit a road block, so here goes -
In a resistive circuit,in order to produce a wattage of 500W with 12VAC, current would be 41A and the resistance would need to be .292ohms. If the voltage was reduced even further the resistance would then need to be reduced in order to allow more current to flow to produce the same 500W.
To produce the same 500W with 600VAC .83A and the resistance would need to be 722ohms.
The reason we would need to reduce the resistance in the 12VAC circuit is because 12VAC simply isn’t enough voltage to push current through 722ohms and produce 500W. The same situation can be said for the 600VAC circuit, if applied to .292ohm the current would be greatly increased and their for wattage.
Im struggling with the relationships, high voltage low current same energy. Low voltage high current same energy.
Maybe this is because .83A flowing through a higher resistance of 722ohms would in fact cause 500W of heat, and 41A flowing through a much lower resistance of .292ohms is needed to produce 500w of heat.
More current is needed to flow in a lower resistance to produce the same heat as a lower current in a higher resistance? Is it just that simple?
Now, when talking about motors single phase squirrel cage induction motor, lets use the same values mentioned above. Wouldn’t the motor with 12V and 83A produce a might higher magnetic field on the stator then the 600V motor with .83A?
I’ve successfully confused the living hell out of myself.... sorry if this makes absolutely no sence to you guys.
i tend to over think certain things and complicate matters.
Im going to explain my problem understanding this very basic situation regarding voltage current,resistance, in a resistive circuit and an inductive circuit. Now, I want to keep things very simple, getting into inductive reactance or impedance etc, shouldn’t need to be brought to the table unless completely necessary.
For what ever reason I’ve hit a road block, so here goes -
In a resistive circuit,in order to produce a wattage of 500W with 12VAC, current would be 41A and the resistance would need to be .292ohms. If the voltage was reduced even further the resistance would then need to be reduced in order to allow more current to flow to produce the same 500W.
To produce the same 500W with 600VAC .83A and the resistance would need to be 722ohms.
The reason we would need to reduce the resistance in the 12VAC circuit is because 12VAC simply isn’t enough voltage to push current through 722ohms and produce 500W. The same situation can be said for the 600VAC circuit, if applied to .292ohm the current would be greatly increased and their for wattage.
Im struggling with the relationships, high voltage low current same energy. Low voltage high current same energy.
Maybe this is because .83A flowing through a higher resistance of 722ohms would in fact cause 500W of heat, and 41A flowing through a much lower resistance of .292ohms is needed to produce 500w of heat.
More current is needed to flow in a lower resistance to produce the same heat as a lower current in a higher resistance? Is it just that simple?
Now, when talking about motors single phase squirrel cage induction motor, lets use the same values mentioned above. Wouldn’t the motor with 12V and 83A produce a might higher magnetic field on the stator then the 600V motor with .83A?
I’ve successfully confused the living hell out of myself.... sorry if this makes absolutely no sence to you guys.