I'm going back to school for HVAC-R. I already have my associates degree in electronics, so I have quite an extensive education in electrical theory. Two questions have recently come up in my mind. Firstly, I completely understand the reason why running a 50 foot extension cord to an appliance is a bad idea. It will obviously more than likely create a very big voltage drop and not give the equipment the specificed required voltage. I know for a fact that some circuit boards will blow up from this. I'm going to probably go and further read into that. I don't think a linear power supply would blow up. I think it may have to do with SMPS only, and most modern appliances I have seen "blow up" have SMPS and not a linear supply. Secondly, a compressor will draw too much current. Ok well first of all my teacher said "coils will draw more current with less voltage". I'm a math guy. I understand things with math. I know for a fact that XL = 2(pi)fL right? That means if I have a fixed inductor and frequency of applied voltage, the only thing that should make the current go down is if the voltage goes down? I dont understand why less voltage would make more current. I actually think that the wrong answer has been given to me. This person also believes that Z's in parallel (impedance) will be added? I have a feeling I'm being confused and misinformed. I have a feeling that faradays law, and perhaps the magnets in the compressors/motors may play a role in the higher current draw?
A compressor for a residential refrigerator has two windings. A start and a run winding. An external relay will bring the start winding in circuit for a moment and then only the run winding will be drawing current. They are basically electrical air compressors.
Please dont tell me random facts that you know about a HVAC-R system. I'm looking for scientifically and mathimatically explained answers.
A compressor for a residential refrigerator has two windings. A start and a run winding. An external relay will bring the start winding in circuit for a moment and then only the run winding will be drawing current. They are basically electrical air compressors.
Please dont tell me random facts that you know about a HVAC-R system. I'm looking for scientifically and mathimatically explained answers.