Transformers are used by electrical power companies to do which of the following?

A. Regulate the amount of voltage and current flowing through power lines.

B. Transform alternating current into direct current.

C. Regulate the amount of heat flowing through power lines.

D. Transition between two different types of metal in power lines.Transformers are used by electrical power companies to do which of the following?The answer is not A. The answer is "none of the above."



The answer that will get you points on your test/homework probably *IS* (A), but it's still wrong. The reason why it is wrong is because of the word "regulate." That word means something, and it has nothing to do with transformers.



Transformers interface between segments of the power line that operate at different impedances. (e.g., a high voltage/low current segment to a low voltage/high current segment).



A "regulator" is an ACTIVE electronic component that maintains either a constant voltage in a circuit (by adjusting the current) or, a constant current (by adjusting the voltage). Transformers are passive. They don't do that.Transformers are used by electrical power companies to do which of the following?
A.Transformers are used by electrical power companies to do which of the following?A.
Transformers are used to make high voltage AC power into a lower voltage. Power is easier to transmit at high voltages because there are less energy losses, but homes are wired for lower voltages, so transformers are necessary to "step-down" the volatge, ie, decrease the voltage.



Thus, (A) is the right answer. They regulate the voltage flowing through power lines (and changes in voltage cause changes in current).Transformers are used by electrical power companies to do which of the following?A.

See the wiki page: http://en.wikipedia.org/wiki/TransformerTransformers are used by electrical power companies to do which of the following?
A seems the answer but not the IDEAL one for the transformers!!!!!!
None of the answers are correct. Your teach will probably tell you (A) is correct, but then she/he deserves a dope slap aside the head for that.



Transformers do not regulate.



.Transformers are used by electrical power companies to do which of the following?
A.



Of course, voltage does not flow, and only currents are regulated, but that is in fact done.



A transformer's current regulation involves a natural feedback process. To begin with, a transformer consists of two coils of wire that share a common magnetic core. When an alternating current flows through the primary coil (the one bringing power to the transformer), that current produces an alternating magnetic field around both coils and this alternating magnetic field is accompanied by an alternating electric field (recall that changing magnetic fields produce electric fields). This electric field pushes forward on any current passing through the secondary coil (the one taking power out of the transformer) and pushes backward on the current passing through the primary coil. The net result is that power is drawn out of the primary coil current and put into the secondary coil current.

What is remarkable about a transformer is that once the load on the secondary coil establishes the secondary current, the primary current is also determined.



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