I have a simple circuit containing a small light bulb, a small DC motor and a 3v DC battery all wired in series. When the motor spins freely the lightbulb is dim, but when I put a load on the motor (by pinching the shaft between my fingers) the light gets brighter.
This is all new to me, but I assume from my observations that the electrical resistance of the motor decreases as the physical load on the motor increases. But I do not understand why?
Can anyone explain?
This is all new to me, but I assume from my observations that the electrical resistance of the motor decreases as the physical load on the motor increases. But I do not understand why?
Can anyone explain?