Electricity And Magnetism

Question 1

What is a transformer?

Answer 1

This is a divice used to change voltages, match impedances, and isolate circuits. It consists of coils of wire wound on a magnetically permeable core. If it is lossless, the power absorbed by the primary winding equals the power generated by the secondary winding

Question 2

What equation gives a circuit’s resonant frequency in terms of its induction, L, and its capacitance,C?

Answer 2

Question 3

What is a resonant circuit?

Answer 3

This is a circuit in which the input voltage and current are in phase

Question 4

What is the complex power vector?

Answer 4

Question 5

What is ohm’s law for AC circuits?

Answer 5

Question 6

What is impedance?

Answer 6

This is the combined effect that circuit elements have on current magnitud and phase. For an ideal resistor it is R, for an ideal capacitor it is 1/jωC, and for an ideal inductor it is jωL