Intro To Transformers Flashcards
What is induction?
When a voltage is induced through relative motion between a conductor and a magnetic field
The property of a circuit that opposes the change in current is called…..
Inductance
The process by which a voltage is produced by the interaction of a conductor and a magnetic field is called….
Induction
What is transformer action?
Mutual induction
Define mutual induction
When the change of current in one circuit induces a voltage in another circuit.
(Two coils wound around the same core)
The coil connected to the source is called the
a) series coil
b) primary coil
c) common coil
d) secondary coil
b) primary coil
What is reluctance?
The opposition to the establishment of magnetic flux in a magnetic circuit
Air has (high/low) reluctance
Air has HIGH reluctance
Iron has (high/low) reluctance
Iron has LOW reluctance
A transformer (conducts / transfers) energy from once circuit to another through ____________ induction.
A transformer TRANSFERS energy from one circuit to another through ELECTROMAGNETIC induction
List 3 basic types of transformers.
Shell
Core
H-type
The core type transformer has the most
a) core losses
b) Eddy currents
c) leakage flux
d) magnetic flux
c) Leakage flux
The H-type transformer is usually found in low voltage applications (true/false)
False.
H-type transformers are found on high-voltage distribution transformers
What is the efficiency rate of transformers?
Between 95% and 98% over a wide range of loads
What are core losses?
Power losses due to hysteresis and Eddy currents
