RS Series Switching Power Supply

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RS Series Switching Power Supply

Q: i have been looking at transformers and i wanted to know a few things. will they do dc current? do they just add x amount of volts or do they multiply by x or just change to x? also there is a sort of container that goes around them is that carbon???? it goes all the way around and then through: It is the reversal of polarity that induces a voltage, therefore only AC. It is the number of turns ratio that determine the voltage of output. It will be the same power (minus transformer losses) in and out. If the number of turns causes a stepped down voltage the current will increase by the same measure.

Q: Hello everyoneI have a 110V hardware plugged in at home (we use 220V) by way of a step down transformer and I was wondering if transformers 'use' more power than usual. I don't want a nasty electircal bill.Because even when the hardware is 'off', the transformer itself is still on. It still hums. I am wondering if the transformer is constantly pulling power out of the wall socket 24/7 if I leave it on.Any help will be greatly appreciated. Thanks all.: A transformer like one you are using is called a step-down transformer because it is changing the source voltage 220vac to 110vac. The answer is yes; it will draw current even though you have no load on the secondary side. This is because the coil on the source side (primary) has a constant current flowing through it; it is a closed loop circuit. The secondary winding(s) produce current flow through electromagnetic inductance by their close proximity to the primary coil. Your rate of current will not be as high if you have a closed circuit on the secondary but current will continue to flow unless you open the circuit on the primary side. I bet that not only does it hum (magnetic field) but it is also warm to the touch. Heat equals energy loss and the energy must be coming for someplace.

Q: 150KVA transformer can withstand much power, how to calculate: 150KVA transformer load capacity is (150 * cosa) KW cosa is the load power factor

Q: 1.Is there going to be a Season 4?2.If there isn't,then is there going to be a new Transformers series?: So far the answer is no it could change, if there is o news at botcon then expect it almost dead.

Q: Any help much appreciated here, I cannot understand the following formulas at all. If there is anyone who can please explain in very SIMPLE words I would be very grateful. My exam is next week and I am still stumped on the following.VP/VS NP/NS IS/IP ok this bit I understand, but then here are the QAs that don't make sense to me:Q1) A single phase transformer has 1250 primary turns and 200 secondary turns. Primary V I are 230V and 3A. What are the secondary V I?A) 1250/200 230/vs transpose too: VS 200 X 230/1250 36.8V Why has it been turned upside down?230/36.8 Is/3transpose too: Is 3 X 230/36.8 18.75A Why??The following Q I am even more stuck withQ2) Single phase transformer has a rating of 300/230V, 15KVA. What is the full load of primary and secondary?A)S VI Where did S come from?!Ip 1500/3300 4.55A KVA - is this taken as the V? Not I? Is that why Is 1500/230 65.22A it has been reversed? I'm very confused, please can someone help explain this process to me?: With good intention, I would criticize UR copying of Q2 :} From the primary (Ip) and secondary (Is) currents listed, this transformer's Voltages should have been: 3300V/230V at 15 KVA note the V(volts) after EACH of the two voltages separated by / and that the primary voltage must be 3300 V and not 300 V in order to agree with Ip Is. I don't know where S comes from, but V?I represents the power rating of a given coil (primary or secondary) in a transformer. If the voltage ratio is 3300/230 14.3478/1 then the current ratio must be the INVERSE 1/14.3478 in order that the power on each side (primary and secondary) is the SAME and equal to 15,000 KVA. {this math assumes 100% efficiency which is an IDEAL case for a transformer}

Q: Can anyone explain what each wire does in this spicific microwave transformer: I believe the two tabs on the lower part of the transformer on your first photo, is where the mains voltage is applied ( 120 or 240 volts AC depending on country used ). If you use an ohmmeter and measure for resistance, there should be a low resistance between the two tabs, and infinite resistance to the other wires and infinite resistance to the frame of the transformer. On the second photo: The two wires will have a high voltage AC output on them when measured from either wire to the frame of the transformer. One end of the high voltage winding is attached to the frame of the transformer as a ground return. You can see the attachment near the top of the transformer. There is also a voltage superimposed between the two wires on the second photo. This is used to heat the filament of the magnetron tube. If you measure the resistance between the two wires you should get a very low resistance. If you measure from one wire and the frame of the transformer, you should get a higher (but not infinite) resistance.

Q: i need a 120VAC to 160VAC step-up transformer; like, not an already built converter, but a just bulk single transformer. where can i buy one?and don't say go look in OKorder, coz i've already looked and there isn't any: The dimensions of a transformer depend on the required current rating. In some circumstances, you could even use a transformer with a multi- tapped primary. By tapping it lower, you may find 160V between the neutral or common tap and a tap higher up the winding. It would be working as an autotransformer, which is not a particularly good form. I would question for what purpose you would need 160V., anyway? It seems a strange voltage to need.?

Q: Why can autotransformers be used as safety transformers? Isolation transformer is a variable ratio of 1 transformer, why has a security role?: The high and low voltage side of the autotransformer is realized by tapping in a coil, and there is no magnetic connection between the two times and there is an electrical connection, so it can not be used as a safety transformer. Isolation transformer high and low voltage coil is separated, the only magnetic connection between the two there is no electrical contact, so the role of security protection.

Q: How does a step down transformer decrease the output voltage but increases the output current? And how does the step up transformer does the opposite thing?: Transformers function as electrical gearboxes to give an analogy. The product of current through the winding and voltage across the winding is the same for both the input winding and the output winding, due to conservation of energy. Transformers trade voltage for current, while, if ideal, preserving transferred power. The way a transformer works, is that when there is a changing magnetic field produced by the input winding (due to a derivative of current through this winding) induces a voltage across the output winding, as per Faraday's law of induction. Because of the self-inductance of the input winding, since it is after all an inductor, the voltages across both windings are both in phase. The higher the frequency used, the better and more efficient the transformer works. To make them work at lower frequencies, it is necessary to make bigger overall windings with larger inductance values. The stepping ratio is set by the number of coils of wire in both windings. The number of coils on the output winding divided by the number of coils on the input winding gives the stepping ratio. Should the stepping ratio be greater than 1, it is a step-up transformer. Should the stepping ratio be less than 1, it is a step-down transformer. Should the stepping ratio be equal to 1, it is called an isolating transformer.