PHEP 4 Flashcards
In a vector the length of the line is proportional to …?
Magnitude of vector quantity
How can two vectors 90 degrees apart be added?
Vector triangle method
What is the sum of the three angles in a right triangle?
180 degrees
In a resistive circuit what happens to all of the power delivered by the source?
It is dissipated by the load
When resistance and capactive reactance are equal, the impedance is ..?
Not one half of either one
In a series LC circuit, one or both of the voltage drops are always greater than …?
The applied voltage
When is the impedance at its minimum and the current at its maximum?
At resonance
The line current in a parallel LCR circuit is equal to …?
The vector sum of the three branch currents
In a resonant circuit, the line current is in phase with …?
Applied voltage
What are transformers often used for?
To match the impedance of a source to that of the load
