What does Ohm’s Law state?
A
Voltage = Current × Resistance B
Voltage = Resistance / Current C
Current = Voltage × Resistance D
Power = Current / Voltage
Analysis & Theory
Ohm’s Law states that V = I × R, where V is voltage, I is current, and R is resistance.
If the resistance is 4Ω and the current is 3A, what is the voltage?
A
1.33V B
7V C
12V D
0.75V
Analysis & Theory
Using V = I × R → V = 3 × 4 = 12V.
Which unit is used to measure resistance?
A
Amperes B
Ohms C
Volts D
Watts
Analysis & Theory
Resistance is measured in Ohms (Ω).
Kirchhoff’s Current Law (KCL) is based on which principle?
A
Energy conservation B
Mass conservation C
Charge conservation D
Power conservation
Analysis & Theory
KCL is based on the conservation of electric charge: the sum of currents entering a junction equals the sum leaving.
What does Kirchhoff’s Voltage Law (KVL) state?
A
Total current entering a junction is zero B
Sum of voltages around a closed loop is zero C
Current is directly proportional to voltage D
Resistance in a closed loop is constant
Analysis & Theory
KVL states that the algebraic sum of all voltages in a closed loop is zero.
In a circuit with 5V source and two resistors (2Ω and 3Ω) in series, what's the current?
A
0.5A B
1A C
2A D
5A
Analysis & Theory
Total resistance = 2 + 3 = 5Ω; I = V / R = 5 / 5 = 1A.
In a parallel circuit, the voltage across each branch is:
A
Different B
Half of total C
Same D
Zero
Analysis & Theory
In a parallel circuit, the voltage across each branch is the same as the source voltage.
Which formula correctly represents Ohm’s Law?
A
I = V / R B
R = V × I C
V = R / I D
P = V / R
Analysis & Theory
Ohm’s Law can be rearranged to I = V / R.
What is the total current entering a node if 3A, 2A, and 1A enter it?
A
3A B
6A C
0A D
5A
Analysis & Theory
Total current entering the node is 3 + 2 + 1 = 6A.
Which law helps analyze a closed loop in an electric circuit?
A
Ohm’s Law B
Kirchhoff’s Current Law C
Kirchhoff’s Voltage Law D
Newton’s Law
Analysis & Theory
Kirchhoff’s Voltage Law (KVL) is used to analyze closed loops in a circuit.