Ohms law dosent apply? It states that when voltage goes down, amperage increase to compensate. Thats why you can’t use an incandescent rated dimmer for speed control on a ceiling fan. What am I missing?
You’re not applying ohm’s law correctly: I=E/R You’re confusing inductive with resistive loads. Current only increases in case of inductive loads during voltage drop.
You are not applying Ohm’s law correctly.
Look at this example:
1200 watt heater @ 120 volts:
I=P/E=1200w/120v=10 amps and the resistance of the heater is R=12Ω (R=E/I=120/10=12)
Same heater at 100 volts:
I=E/R=100/12Ω=8.3 amps
For a resistive load when the voltage decreases the current also decreases because the voltage and current are directly proportional meaning that they both go up or down. For an inductive load like a motor they are inversely proportional so a reduction in voltage will cause an increase in current.
Thanks guys, I get it now. My mind automatically defaulted to inductive loads- a hidden mental blind spot