- #1
mrkevelev
- 5
- 0
How is motor speed regulated (lets say a PM DC motor)? Is the voltage kept constant, and current increased/decreased, or is current kept same and voltage increased/decreased or both? What about torque and speed? Will giving a motor too much voltage or current damage it? I'm trying to understand what changes and what stays the same. Another example is a light bulb. Let's say its a 120 V, 60 W bulb. So to increase the brightness would mean decreasing resistance, thus increasing current, and thus increasing power. But would giving it too much current blow the bulb or giving it too much voltage, or only the power? Again, I thought I heard once something like "a device only will draw the current it needs" but that part I don't understand. Thanks.