Branches tied to the same two nodes have equal what?
A Current
B Resistance
C Power
D Voltage
Answer: D. Voltage. Parallel branches share the same voltage across their common nodes.
What total resistance results when 5 Ω and 11 Ω are connected in series?
A 55 Ω
B 2.5 Ω
C 6 Ω
D 16 Ω
Answer: D. 16 Ω. Series resistances add: 5 + 11 = 16 Ω.
Two 8 Ω resistors in parallel yield what?
A 16 Ω
B 4 Ω
C 64 Ω
D 8 Ω
Answer: B. 4 Ω. Two equal 8 Ω resistors in parallel have equivalent 4 Ω.
Across 6 kΩ, a 24 V source supplies how much current?
A 0.25 mA
B 144 mA
C 3 mA
D 4 mA
Answer: D. 4 mA. Ohm’s law gives 24 V/6 kΩ = 4 mA.
Through 8 Ω, a 2 A current dissipates how much power?
A 16 W
B 32 W
C 64 W
D 4 W
Answer: B. 32 W. P = I²R = 2² × 8 = 32 W.
Which formula gives resistor power from voltage and current?
A P = V × I
B P = I/R
C P = V/I
D P = V + I
Answer: A. P = V × I. Electrical power is voltage multiplied by current: P = VI.
Kirchhoff’s current law reflects conservation of what?
A Charge
B Energy
C Power
D Momentum
Answer: A. Charge. KCL follows from conservation of electric charge at a junction.
Kirchhoff’s voltage law reflects conservation of what?
A Energy
B Momentum
C Charge
D Resistance
Answer: A. Energy. KVL expresses energy conservation around a closed path.
For measuring voltage across a component, a voltmeter goes where?
A Source only
B Open circuit
C Parallel
D Series
Answer: C. Parallel. A voltmeter measures potential difference, so it is connected in parallel.
For measuring branch current, an ammeter goes where?
A Series
B Across supply
C Open circuit
D Parallel
Answer: A. Series. An ammeter measures branch current and is inserted in series.
The ratio V/I for an ohmic resistor equals what?
A Conductance
B Resistance
C Capacitance
D Reactance
Answer: B. Resistance. Ohm’s law gives V/I = R for an ohmic resistor.
During normal operation, an ideal closed switch is like what?
A Short circuit
B Voltage source
C Current source
D Open circuit
Answer: A. Short circuit. An ideal closed switch has zero resistance.
What resistance does an ideal open switch have?
A Negative
B Zero
C One ohm
D Infinite
Answer: D. Infinite. An ideal open switch carries no current and has infinite resistance.
For four equal 2 Ω resistors in series, total resistance?
A 16 Ω
B 2 Ω
C 4 Ω
D 8 Ω
Answer: D. 8 Ω. Four series resistors add to 8 Ω.
What voltage appears across the lower 4 kΩ resistor in a 12 V divider with 2 kΩ above it?
A 6 V
B 4 V
C 8 V
D 10 V
Answer: C. 8 V. The series current is 12/6 kΩ = 2 mA; the 4 kΩ drop is 8 V.
In parallel 6 Ω and 3 Ω branches, how much of the entering 3 A flows through 3 Ω?
A 1.5 A
B 2 A
C 1 A
D 0.5 A
Answer: B. 2 A. Current divides inversely with resistance: I3Ω = 3 × 6/(6+3) = 2 A.
In nodal analysis, each unknown is usually a what?
A Branch power
B Node voltage
C Mesh current
D Loop resistance
Answer: B. Node voltage. Nodal analysis solves node voltages relative to a reference node.
Mesh analysis assigns a current to each what?
A Source
B Node
C Branch
D Independent loop
Answer: D. Independent loop. Mesh analysis assigns a circulating current to each independent planar mesh.
What common name is given to a reference node?
A Neutral
B Ground
C Port
D Branch
Answer: B. Ground. The chosen reference node is often labeled ground and set to zero volts.
How many meshes exist in a connected network with one independent loop?
A Zero
B Four
C One
D Two
Answer: C. One. One independent planar loop corresponds to one mesh.
For a 20 V source with 2 Ω series resistance, what short-circuit current flows?
A 2 A
B 4 A
C 10 A
D 20 A
Answer: C. 10 A. With the output shorted, I = 20/2 = 10 A.
Conductance of a 2 kΩ resistor equals what?
A 0.5 S
B 2 mS
C 0.5 mS
D 2 S
Answer: C. 0.5 mS. G = 1/2000 S = 0.5 mS.
Doubling current through a fixed resistor changes its voltage how?
A Doubles it
B Leaves it unchanged
C Quadruples it
D Halves it
Answer: A. Doubles it. With fixed R, V = IR makes voltage proportional to current.
From a 3 A current through 4 Ω, how much power is dissipated?
A 36 W
B 24 W
C 12 W
D 48 W
Answer: A. 36 W. P = I²R = 3² × 4 = 36 W.
Two 1 kΩ resistors in parallel equal what?
A 250 Ω
B 1 kΩ
C 500 Ω
D 2 kΩ
Answer: C. 500 Ω. Two equal 1 kΩ resistors in parallel have equivalent 500 Ω.