Basic Electrical Flashcards
7 cards from real BEE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Basic Electrical flashcards as text
Norton's theorem represents a network as:
Answer: A current source in parallel with a resistance
Norton's equivalent is a current source I_N in parallel with R_N at the terminals.
The power factor of a purely resistive circuit is:
Answer: 1
In a purely resistive circuit voltage and current are in phase, so PF = cos(0°) = 1.
A wire carries 3 A and has a resistance of 0.5 Ω. What is the voltage drop across it?
Answer: 1.5 V
V = IR = 3 × 0.5 = 1.5 V.
Faraday's law of electromagnetic induction states that the induced EMF is proportional to the:
Answer: Rate of change of magnetic flux
Faraday's law: EMF = -dΦ/dt; the induced EMF equals the rate of change of magnetic flux linkage.
What is the impedance of a series RLC circuit at resonance?
Answer: Equal to R only
At resonance, X_L = X_C, so they cancel and Z = R.
The unit of magnetic flux density is:
Answer: Tesla
Magnetic flux density B is measured in Tesla (T) in the SI system.
Superposition theorem is applicable only to:
Answer: Linear circuits
Superposition requires linearity; it cannot be applied to circuits with non-linear elements like diodes.