Ive been reading books on theory alot lately trying to understand certain things. In my theory book it states that when the voltage is doubled the current is doubled for a fixed resistance,I got that. If voltage is halfed, current is halfed and so on. I draw out series and parallel circuits test with ohms law and all is well.

But I noticed today that when you double the voltage on motors the current is halfed. And when you double the voltage on a 1500 watt heater the current is halfed. This is confusing Ive been reading for hours trying to figure this out so I'll be able to sleep tonight....

I was thinking maybe theres different taps for different resistances for 120/240 heaters, one with lower resistance for 120 and 1 with higher for 240?

Could that be the case for motors too, different taps at a different point on the motor windings to vary the resistance.

I would really appreciate some help with this.

Thanks

But I noticed today that when you double the voltage on motors the current is halfed. And when you double the voltage on a 1500 watt heater the current is halfed. This is confusing Ive been reading for hours trying to figure this out so I'll be able to sleep tonight....

I was thinking maybe theres different taps for different resistances for 120/240 heaters, one with lower resistance for 120 and 1 with higher for 240?

Could that be the case for motors too, different taps at a different point on the motor windings to vary the resistance.

I would really appreciate some help with this.

Thanks

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