[D2L] 103F Flashcards
when illuminated, an incandescent light bulb will have a magnetic field close to the filament (glowing coil)?
True
By winding a conductor into a coil, an electromagnet with poles will be produced when current is passed through the conductor?
True
increasing the flow of current through a coil will..
increase the strength of the magnetic field
the number of lines of magnetic flux may be increased by adding a core, made of non-ferrous material, in the middle of the coil
False, has to be ferrous material
ferromagnetic materials that allow magnetic flux to pass through them easily are said to have a high
permeability(투과성)
a material that does not allow easy passage of magnetic flux is said to have a high
reluctance
in a magnetic circuit, the concept of reluctance behaves very similarly to the property of ……………. in an electrical circuit
resistance
in an electromagnetic circuit, increasing the number of turns of the conductor on the coil while leaving all other parts of the circuit unchanged will provide
a greater emf
the emf that is induced in a circuit by electromagnetism, is proportional to the rate of change of flux linkage. this statement could be used to summarize?
faraday’s law
if the direction of current flow is reversed through a coil, the resulting magnetic field will..?
reverse direction
DC transformers exist
False, only AC transformers
passing a conductor in parallel to existing lines of flux will induce a current of electromotive force?
False, if parallel then creates nothing
an alternator converts…………………, into…………………… energy
mechanical, electrical
in order to provide a useful low voltage control signal, a transformers primary and secondary coils should be in contact at each end of their conductors?
False
