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
A resistor of 10 Ω is connected in parallel with another resistor of 40 Ω. What is the equivalent resistance?
Answer: 8 Ω
For parallel resistors: 1/R = 1/10 + 1/40 = 5/40, so R = 8 Ω.
Which of the following best describes the behavior of an inductor in a DC steady-state circuit?
Answer: It acts as a short circuit
In DC steady state, the inductor has no changing current, so its voltage drop is zero — it acts as a short circuit (wire).
If the voltage across a 5 Ω resistor is 20 V, what is the power dissipated?
Answer: 80 W
P = V²/R = 400/5 = 80 W.
Kirchhoff's Current Law (KCL) is based on which conservation principle?
Answer: Conservation of charge
KCL states that the algebraic sum of currents at a node is zero, which follows from conservation of electric charge.
A 100 μF capacitor is charged to 50 V. How much energy is stored?
Answer: 0.125 J
E = ½CV² = ½ × 100×10⁻⁶ × 2500 = 0.125 J.
What happens to the total resistance of a series circuit when one more resistor is added?
Answer: It increases
Series resistances add directly, so adding any positive resistance always increases total resistance.
Which law relates the magnetic field around a conductor to the current flowing through it?
Answer: Ampere's Law
Ampere's Law states that the line integral of magnetic field around a closed path equals the enclosed current times μ₀.