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Quizzes > Science

Current electricity test: check circuits, current, and resistance

Quick, free electricity quiz. Instant results to check your understanding.

Editorial: Review CompletedCreated By: Suresh RamUpdated Aug 24, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for electricity quiz on golden yellow background

Use this current electricity quiz to check your grasp of current, resistance, and simple circuits, and see where to study more. If you want focused practice, try an ohm's law quiz or sharpen basics with an electrical circuits quiz. For number work, build speed with a short circuit calculation test.

What is the SI unit of electric current?
Ampere
Volt
Ohm
Watt
The SI unit of electric current is the ampere, often shortened to amp, which is defined by the flow of one coulomb of charge per second. It is one of the seven base units in the International System of Units. Accurate current measurement is fundamental in circuit analysis and device specifications.
What is the SI unit of electrical resistance?
Coulomb
Ampere
Ohm
Joule
Resistance is measured in ohms, symbolized by ?, and defined as the ratio of voltage to current (V/I). One ohm is the resistance that produces one ampere of current when one volt is applied. This unit is named after Georg Simon Ohm, who formulated Ohm's law.
Which equation represents Ohm's law?
I = V / P
V = I × R
R = V + I
P = I × V
Ohm's law states that the voltage V across a conductor is directly proportional to the current I flowing through it, with the constant of proportionality being the resistance R. This relationship holds for many materials under constant temperature. It forms the basis for analyzing simple electric circuits.
In a series circuit, which quantity remains the same through all components?
Voltage
Power
Resistance
Current
In a series circuit, the same current flows through each component because there is only one path for charge to move. The total voltage is divided among the components, while resistances add up. Understanding series behavior is essential for designing circuits with specific current requirements.
In a parallel circuit, what is common to all branches?
Power dissipated in each branch
Current in each branch
Voltage across each branch
Resistance in each branch
In a parallel circuit, each branch is connected directly across the supply, so the voltage across each branch is the same. Currents divide according to resistance of each branch, and total current is the sum of branch currents. Parallel circuits are common in household wiring.
What is the total resistance of two resistors, 4 ? and 6 ?, connected in series?
2.4 ?
10 ?
24 ?
0.667 ?
Resistors in series simply add: R_total = R1 + R2 = 4 ? + 6 ? = 10 ?. This is because the same current flows through both resistors, and their voltage drops sum. Series combinations are used to achieve higher resistances.
What is the equivalent resistance of two resistors, 4 ? and 6 ?, connected in parallel?
2.4 ?
10 ?
0.667 ?
1.5 ?
For resistors in parallel: 1/R_total = 1/4 + 1/6 = 5/12, so R_total = 12/5 = 2.4 ?. Parallel combination reduces overall resistance. This is crucial when designing circuits that require lower resistance paths.
According to Kirchhoff's current law, the sum of currents entering a junction is equal to:
Zero
The resistance at the junction
The total voltage at the junction
The sum of currents leaving the junction
Kirchhoff's current law states that charge is conserved at a junction, so the algebraic sum of currents entering equals the sum leaving. This law is applied to analyze complex circuits with multiple branches.
A 12 V battery is connected across a 6 ? resistor. What is the current through the resistor?
72 A
0.5 A
2 A
18 A
Ohm's law (I = V/R) gives I = 12 V / 6 ? = 2 A. This simple calculation is used in basic circuit analysis and design. Ensuring correct current prevents component overheating.
A copper wire has resistivity 1×10?? ?·m, length 2 m, and cross-sectional area 1×10?? m². What is its resistance?
0.1 ?
0.5 ?
1 ?
2 ?
Resistance R = ?L/A = (1×10?? ?·m)(2 m)/(1×10?? m²) = 2 ?. This formula links material properties (resistivity) with geometry for practical resistor design.
Why does a tungsten filament lamp not obey Ohm's law strictly?
Its length varies with current
It is superconducting at room temperature
Its resistance changes with temperature
It has internal capacitance
Tungsten's resistance increases significantly as the filament heats up when current flows. Ohm's law applies only when resistance remains constant. The non-linear V-I characteristic of filament bulbs arises from the strong temperature dependence of resistivity.
What is the drift velocity of electrons if a current of 2 A flows through a copper wire of radius 1 mm, given electron density n = 8.5×10²? m?³?
1×10?? m/s
0.1 m/s
5×10?? m/s
100 m/s
Drift velocity v = I/(n e A). Here A = ?(1×10?³ m)², e = 1.6×10?¹? C, giving v ? 5×10?? m/s. Electron drift is very slow despite high current.
Calculate the equivalent resistance of a 6 ? and 3 ? resistor in parallel, then in series with a 2 ? resistor.
4 ?
5 ?
8 ?
3 ?
First find parallel: 1/R_p = 1/6 + 1/3 = 1/2, so R_p = 2 ?. Then series with 2 ? gives 2 + 2 = 4 ?. Combining series and parallel is key to complex circuit analysis.
In a potential divider with R1 and R2 in series across a source V_in, what is the output voltage across R2?
V_in × (R1 + R2) / R2
V_in × R2 / (R1 + R2)
V_in / (R1 + R2)
V_in × R1 / (R1 + R2)
A potential divider divides voltage proportionally: V_out = V_in × R2/(R1+R2). This principle underlies adjustable voltage references and sensor circuits.
A battery of EMF 12 V and internal resistance 1 ? is connected to a variable load. When the load is 5 ?, what is the terminal voltage across the load?
8 V
12 V
10 V
6 V
Terminal voltage V = ? × R_load / (R_load + r) = 12 V × 5 ?/(5 ? + 1 ?) = 10 V. This calculation accounts for internal resistance affecting output under load.
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Study Outcomes

  1. Calculate Electrical Quantities -

    Apply Ohm's Law to determine current, voltage, and resistance values in DC circuits accurately.

  2. Analyze Circuit Configurations -

    Differentiate between series and parallel circuits and predict how changes in one component affect total current flow.

  3. Interpret Circuit Diagrams -

    Read and sketch standard DC circuit symbols to identify key components and their connections.

  4. Evaluate Effects of Resistance -

    Assess how varying resistance impacts current and voltage distribution in different circuit setups.

  5. Reinforce Core Concepts -

    Strengthen understanding of current electricity quiz topics through targeted questions on electric current trivia and DC circuit questions.

  6. Self-Assess Physics Knowledge -

    Use quiz scores to gauge proficiency in current electricity test material and pinpoint areas for further study.

Cheat Sheet

  1. Understanding Electric Current -

    Electric current I = Q/t measures the charge flow per second (1 A = 1 C/s), so picturing electrons racing at 1 C every second can boost your intuition. Remember "I Is In-line" to recall current is the rate of charge moving through a conductor. (Source: HyperPhysics)

  2. Mastering Ohm's Law -

    Ohm's Law (V = IR) links voltage, current, and resistance; for example, a 12 V battery driving 2 A yields a 6 Ω resistor. Use the friendly mnemonic "Vir I?" to quiz yourself on V, I, R order in any Ohm's Law quiz. (Source: MIT OpenCourseWare)

  3. Analyzing Series and Parallel Circuits -

    In series circuits resistances add (R_total = R1 + R2), while in parallel their reciprocals add (1/R_total = 1/R1 + 1/R2). A quick tip: "S P S - Series Plus Sum, Parallel Same Space" helps you pick the right formula in DC circuit questions. (Source: University Physics)

  4. Applying Kirchhoff's Circuit Laws -

    Kirchhoff's Current Law (KCL) states that the sum of currents entering a node equals the sum leaving it, and Kirchhoff's Voltage Law (KVL) says the sum of emfs equals the sum of IR drops around any loop. Practicing multi-loop problems with KCL and KVL will supercharge your electric current trivia skills. (Source: IEEE Education)

  5. Relating Resistivity and Temperature -

    Resistance R = ϝL/A depends on material resistivity (ϝ), length (L), and cross-sectional area (A); metals typically have ϝ rising with temperature. Remember that twist when a DC circuit question asks how R changes as a wire heats up! (Source: NIST)

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