Electrical Circuits and Systems Flashcards
6 cards from real Fundamentals of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Electrical Circuits and Systems flashcards as text
In a series RLC circuit at resonance, what is the impedance?
Answer: Equal to R (purely resistive)
At resonance, inductive and capacitive reactances cancel (X_L = X_C), leaving only resistance Z = R.
What is the power dissipated in a resistor of 10 Ω carrying a current of 3 A?
Answer: 90 W
Power P = I²R = (3)² × 10 = 9 × 10 = 90 W.
What type of filter passes low frequencies and attenuates high frequencies?
Answer: Low-pass filter
A low-pass filter allows frequencies below a cutoff frequency to pass while attenuating higher frequencies.
Norton's equivalent circuit consists of:
Answer: A current source I_N in parallel with a resistance R_N
Norton's theorem represents any linear network as a current source I_N in parallel with Norton resistance R_N.
For a transformer with a turns ratio N₁:N₂ = 1:10, if the primary voltage is 120 V, what is the secondary voltage?
Answer: 1,200 V
Transformer voltage ratio: V₂/V₁ = N₂/N₁ = 10/1, so V₂ = 120 × 10 = 1,200 V.
What does the Bode plot display on its vertical and horizontal axes?
Answer: Magnitude (dB) and phase (degrees) vs. log frequency
A Bode plot shows gain in decibels and phase in degrees as functions of logarithmic frequency.