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Quizzes > Quizzes for Business > Technology

Master the Electrical Fundamentals Quiz

Test your core electrical principles knowledge today

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art depicting elements related to Electrical Fundamentals Quiz

Welcome to this electrical fundamentals quiz, where you'll explore key electrical circuits concepts in an engaging multiple-choice format. Ideal for aspiring electricians and engineering students, this quiz helps reinforce Ohm's Law, circuit analysis, and safety best practices. You can also try the Electrical Engineering Fundamentals Quiz or deepen your knowledge with the Electrical Code Compliance Quiz. All questions are fully editable in our editor, and you can discover more quizzes to keep improving your skills.

What is the SI unit of electrical resistance?
Ampere (A)
Volt (V)
Watt (W)
Ohm (Ω)
The ohm is defined as the resistance between two points of a conductor when a constant potential difference of one volt applied produces a current of one ampere. It is symbolized by the Greek letter Ω. This unit quantifies how much a component resists current.
Which symbol represents capacitance in electrical schematics?
R
I
L
C
The symbol C is used to denote capacitance in circuit diagrams. The letter R denotes resistance, L denotes inductance, and I denotes electric current.
According to Ohm's Law (V = I × R), what does V represent?
Power
Current
Resistance
Voltage (potential difference)
In the formula V = I × R, V stands for voltage or potential difference across a component. I is the current through it and R is its resistance. Power is calculated separately as P = V × I.
What is the SI unit for electric current?
Coulomb (C)
Watt (W)
Joule (J)
Ampere (A)
The ampere, symbolized as A, is the SI unit of electric current, defined as one coulomb of charge passing a point per second. A coulomb is a unit of charge, watt is power, and joule is energy.
In a series circuit, the electric current through each component is:
Zero
Different in each branch
Split at junctions
The same at all points
In a series circuit there is only one path for current flow, so the same current passes through every component. Current splitting or varying occurs only in parallel circuits.
Two resistors of 4 Ω and 6 Ω are connected in series. What is their total resistance?
24 Ω
10 Ω
2.4 Ω
6.32 Ω
Resistances in series add directly: R_total = 4 Ω + 6 Ω = 10 Ω. The value 2.4 Ω corresponds to a parallel combination, 24 Ω is a multiplication error, and 6.32 Ω is the square root of 40.
Two resistors of 4 Ω and 6 Ω are connected in parallel. What is their total resistance?
0.67 Ω
2.4 Ω
1.5 Ω
10 Ω
For parallel resistors: 1/R_total = 1/4 + 1/6 = 5/12, so R_total = 12/5 = 2.4 Ω. A series sum would be 10 Ω, and 0.67 Ω or 1.5 Ω are incorrect reciprocals.
A 12 V battery supplies 3 A to a circuit. What is the circuit's resistance?
4 Ω
36 Ω
9 Ω
0.25 Ω
Ohm's Law gives R = V / I = 12 V / 3 A = 4 Ω. The other values come from incorrect divisions or inversions.
Which component stores energy in an electric field?
Capacitor
Diode
Resistor
Inductor
Capacitors store energy in the electric field between their plates. Inductors store energy in a magnetic field, resistors dissipate energy as heat, and diodes control current direction.
How does an inductor respond to a change in current?
It stores electric charge
It opposes the change
It blocks DC
It reduces resistance
An inductor resists changes in current by developing a voltage opposing that change (Lenz's law). Capacitors store charge, resistors provide resistance, and inductors allow steady DC current.
In a parallel circuit, the voltage across each branch is:
Additive across branches
The same for all branches
Inversely proportional to branch resistance
Zero
Each branch in a parallel circuit shares the same two nodes, so the voltage across each branch equals the supply voltage. Current, not voltage, varies with resistance in parallel paths.
What is the total capacitance of two 5 µF capacitors connected in series?
1.25 µF
5 µF
10 µF
2.5 µF
For capacitors in series: 1/C_total = 1/5 + 1/5 = 2/5, so C_total = 5/2 = 2.5 µF. In parallel they would sum to 10 µF.
Which practice best reduces the risk of electric shock?
Disconnect power before working
Work with wet hands
Wear shorts
Bypass grounding
Disconnecting power ensures circuits are de-energized and prevents shock. Wearing shorts, wet hands, or bypassing ground increases hazard rather than reduces it.
What power is dissipated by a 2 Ω resistor carrying 3 A?
6 W
36 W
9 W
18 W
Power in a resistor is P = I²R = (3 A)² × 2 Ω = 9 × 2 = 18 W. Other values come from incorrect formulas or arithmetic.
Which law states that the sum of currents entering a junction equals the sum leaving?
Coulomb's Law
Kirchhoff's Current Law
Ohm's Law
Kirchhoff's Voltage Law
Kirchhoff's Current Law (KCL) asserts that currents entering and leaving a node sum to zero. KVL deals with voltage around loops, Ohm's Law relates V, I, and R, and Coulomb's Law concerns electrostatic force.
Three resistors (2 Ω, 3 Ω, 5 Ω) are in series across a 10 V source. What is the circuit current?
10 A
2 A
1 A
0.1 A
Total resistance is 2 + 3 + 5 = 10 Ω. Current = V / R = 10 V / 10 Ω = 1 A. Other values stem from incorrect sums or divisions.
In a series circuit with a 1 mH inductor at 50 Hz, what is the inductive reactance (X_L)?
0.314 Ω
0.0314 Ω
3.14 Ω
31.4 Ω
X_L = 2πfL = 2π × 50 Hz × 0.001 H ≈ 0.314 Ω. The larger values come from missing decimals or multiplying incorrectly.
What is the total capacitance of a 4 µF and a 12 µF capacitor connected in parallel?
3 µF
8 µF
16 µF
48 µF
Capacitances in parallel add directly: C_total = 4 µF + 12 µF = 16 µF. The other answers reflect incorrect operations.
At resonance in a series RLC circuit, the impedance is:
Equal to R
Infinite
Equal to X_L + X_C
Zero
At resonance, inductive reactance (X_L) and capacitive reactance (X_C) cancel, leaving impedance purely resistive (Z = R). It is neither zero nor infinite.
A 1 kΩ resistor and 1 µF capacitor form an RC charging circuit on a 9 V source. After one time constant, the capacitor voltage is approximately:
3.3 V
9 V
5.7 V
0 V
After one time constant (τ = R·C = 1 ms), the capacitor charges to V(1 − e^(−1)) ≈ 9 V × 0.632 = 5.7 V. Other values correspond to different points in the charge curve.
0
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Learning Outcomes

  1. Identify basic electrical units and their symbols
  2. Apply Ohm's Law to calculate voltage, current, and resistance
  3. Analyse series and parallel circuit behaviors
  4. Evaluate the function of resistors, capacitors, and inductors
  5. Demonstrate safe practices when working with live circuits
  6. Master fundamental electrical theory for practical applications

Cheat Sheet

  1. Understand Basic Electrical Units and Symbols - Dive into the world of volts (V), amperes (A), and ohms (Ω) like learning your favorite emojis. Recognizing these basic units and their symbols is your first step to becoming a circuit detective, able to interpret any diagram. Wikipedia: Ohm
  2. Master Ohm's Law - Ohm's Law is the superhero of circuits, showing that voltage (V) equals current (I) times resistance (R). Once you see V = I × R in action, you can calculate missing values with the precision of a math magician. This powerful relationship unlocks almost every beginner circuit problem. Wikipedia: Ohm's Law
  3. Analyze Series Circuits - Picture electrons lining up like cars on a single-track roller coaster: the same current flows through every component. The total resistance is just a sum of its parts (R₝ + R₂ + R₃…), so adding more resistors slows the ride. Series circuits are simple yet teach you the art of circuit building. Physics Classroom
  4. Understand Parallel Circuits - Think of parallel circuits as a multi-lane highway where each lane gets the same voltage. Adding lanes (resistors) actually lowers overall resistance, letting more current zoom through. This setup is perfect for powering multiple devices without slowing each one down. Keysight Labs
  5. Learn the Functions of Resistors, Capacitors, and Inductors - Resistors act like speed bumps for current, capacitors store and release energy like mini batteries, and inductors fight sudden changes in current like stubborn gatekeepers. Each component adds its own flavor to circuit behavior and design. Wikipedia: Electrical Components
  6. Apply Kirchhoff's Laws - In Kirchhoff's Voltage Law (KVL), the sum of voltages around any loop is zero, while his Current Law (KCL) says currents entering a junction equal those leaving. These rules help you untangle the knottiest circuits as if solving a thrilling puzzle. Ibiblio: Kirchhoff's Laws
  7. Calculate Power in Electrical Circuits - Power (P) is the rate of energy flow, given by P = V × I. By plugging in voltage and current, you can see how much juice a device really uses - handy for budgeting energy or designing efficient gadgets. All About Circuits
  8. Understand the Behavior of Capacitors in Series and Parallel - In series, capacitors share the workload and total capacitance drops (1/C_total = 1/C₝ + 1/C₂ + …), but in parallel, they team up to boost storage (C_total = C₝ + C₂ + …). Mastering this helps you fine-tune how long circuits can hold charge. Wikipedia: Series & Parallel Circuits
  9. Recognize the Impact of Inductors in Circuits - Inductors resist changes in current, acting like momentum keepers in a circuit. When current shifts rapidly, they can create voltage spikes, so understanding their behavior is key for managing sudden surges. Wikipedia: Inductor
  10. Practice Electrical Safety - Treat electricity with respect: always switch off power before tinkering, wear protective gear, and double-check your work. Good safety habits prevent sparks from flying - literally! OpenStax Physics: Series Circuits
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