Electric Circuits 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 Electric Circuits flashcards as text
A 10 Ω resistor and a 40 Ω resistor are connected in parallel. What is the equivalent resistance?
Answer: 8 Ω
Parallel resistance: 1/Req = 1/10 + 1/40 = 5/40, so Req = 8 Ω.
Which of the following best describes a node in circuit analysis?
Answer: A point where two or more circuit elements meet
A node is any point in a circuit where two or more elements are connected together.
A capacitor of 100 µF is charged to 50 V. How much energy is stored?
Answer: 0.125 J
Energy stored in a capacitor: E = ½CV² = ½ × 100×10⁻⁶ × 50² = 0.125 J.
In a series RLC circuit at resonance, the impedance is purely:
Answer: Resistive
At resonance, inductive and capacitive reactances cancel, leaving only the resistive component.
What does the time constant τ represent in an RC circuit?
Answer: The time for the capacitor to charge to 63.2% of its final value
The time constant τ = RC is the time required for the capacitor voltage to reach approximately 63.2% of its final steady-state value.
Applying KVL to a loop, you sum all voltage drops and rises. The result must equal:
Answer: Zero
Kirchhoff's Voltage Law states that the algebraic sum of all voltages around any closed loop equals zero.
Two capacitors of 6 µF and 3 µF are connected in series. What is the equivalent capacitance?
Answer: 2 µF
Series capacitance: 1/Ceq = 1/6 + 1/3 = 1/2, so Ceq = 2 µF.