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Ch.4

Electromagnetism

QuestionAnswer
Changes in direction, establishes and collapses in the magnetic field AC current
devices used for changing the potential of alternating currents involving two coils primary and secondary Transformers
voltage from the first primary coil is increased to the secondary coil step-up transformer
voltage from primary coil is decreased to the secondary coil step-down transformer
Calculates the voltage and the number of turns in the secondary and primary coils Transformer Law: Vs/Vp = Ns/Np
Calculates current AMPERAGE (I) in combination with the transformer law Ohm's Law Is/Ip =Vp/Vs
Amps _______ as voltage _______ in step-up decrease, increases
Caused by highly induced voltages and massive amounts wires in step-up transformers power loss
copper loss, resistant to current flow I2R loss
lag loss due to fluctuating AC current Hysteresis
current opposition to its original Eddy current
Name four core configurations Air,Open,Closed,Shell-Type
Which core configurations most commonly used in cray generators? Shell-Type
Primary/Secondary coils are connected in series rather than insulation in this type of transformer autotransformer
Three major transformers in an x-ray circuit Autotransformer, High-voltage step-up transformer, Filament Step-down transformer
decreases incoming line voltage to heat the tube filament Filament Step-down transformer
this type of transformer raises incoming line voltage needed for xray production High-voltage step-up transformer
varies incoming line voltage Autotransformer
Device capable of accumulating and storing electrical charge, and commonly used in portables capacitors
Uses only half of incoming alternating current to be converted to pulsating direct current half-wave rectification
Use of four rectifiers(4 diodes) in the secondary coil of step-up transformer full-wave rectification
Converts negative part of AC sine wave to positive current, flowing in one direction full wave rectification
Created by: nwfsc