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Quizzes > Science > Physics

Electricity Quiz: Are You a Charged Particle Pro?

Ready for electricity trivia? Take the electric current quiz now!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration of battery, lightning bolt, and charged particles for electricity quiz on coral background

This Electricity Quiz helps you practice the basics of charged particles, electric current, fields, and circuits. Work through fast, clear questions on electrostatics and magnetism, plus a short current skills check , so you can spot gaps before your next test.

What is the magnitude of the elementary charge?
3.2 × 10^-19 coulombs
9.11 × 10^-31 coulombs
1.6 × 10^-18 coulombs
1.6 × 10^-19 coulombs
The elementary charge is the charge carried by a single proton or the magnitude of the charge of an electron, approximately 1.602×10^-19 C. This value is a fundamental constant used in many physics equations. It defines the basic unit of electric charge.
Which particle carries a negative electric charge?
Proton
Electron
Neutron
Alpha particle
Electrons are fundamental particles with a negative electric charge of - 1 elementary charge. Protons have positive charge and neutrons are neutral. Alpha particles consist of two protons and two neutrons, giving them a positive charge.
What is the SI unit of electric current?
Coulomb
Volt
Ampere
Ohm
The ampere (A) is the SI base unit of electric current, defined by the flow of one coulomb of charge per second. Voltage is the potential difference, ohm is resistance, and coulomb is charge.
Ohm's law states the relationship between which quantities in an electrical circuit?
Charge, energy, and time
Power, current, and voltage
Magnetic field, current, and length
Voltage, current, and resistance
Ohm's law defines that V = I × R, relating voltage (V), current (I), and resistance (R) in a conductor. It is fundamental for analyzing simple circuits. Power formulas and magnetic effects involve different laws.
Which of the following materials is a good electrical conductor?
Copper
Glass
Plastic
Rubber
Copper has high conductivity due to its free electrons, making it widely used in wiring. Rubber, glass, and plastic are insulators because they lack mobile charge carriers.
Static electricity is primarily caused by the transfer of what between objects?
Neutrons
Protons
Electrons
Photons
Static electricity results when electrons move from one object to another, leaving imbalanced charges. Protons are bound in nuclei and cannot move freely in ordinary materials. Neutrons and photons are not involved in static charge buildup.
In which direction does conventional current flow in a circuit?
Perpendicular to the electric field
Randomly in all directions
From negative to positive potential
From positive to negative potential
By convention, current is defined as the flow of positive charge from higher to lower potential, i.e., positive to negative. Electron flow is opposite, but conventional current follows the historical definition.
What does voltage measure in an electric circuit?
Total charge in a circuit
Electric potential difference between two points
Rate of electron flow
Resistance to current
Voltage, or electric potential difference, is the work done per unit charge to move a charge between two points. Current measures flow rate and resistance measures opposition to flow.
In a series circuit, how does the current behave through each component?
Current flows only through the largest resistor
The same current flows through all components
Current divides inversely with resistance
Current is zero after the first component
In a series circuit, there is only one path for current, so the same current passes through every component. Voltage divides, but current remains constant.
In a parallel circuit, what is true about the voltage across each branch?
It is higher in branches with lower resistance
It is the same across all branches
It is zero across ideal branches
It is lower in branches with higher resistance
Voltage is the same across all branches in a parallel circuit because each branch connects directly to the same two nodes. Current divides but voltage remains equal.
How does the resistivity of most metals change with increasing temperature?
It remains constant
It oscillates
It increases
It decreases
As temperature rises, metal ions vibrate more, scattering free electrons and increasing resistivity. Most conductors show a positive temperature coefficient of resistance.
According to Coulomb's law, the electric force between two point charges is proportional to what?
The product of the charges divided by the square of their separation
The sum of the charges times the distance
The square of the product of the charges
The product of the charges times the separation
Coulomb's law states F = k·q1·q2/r^2, so force varies directly with the product of charges and inversely with the square of the distance. This fundamental law describes electrostatic interactions.
What is the expression for the electric field at a point in space?
Electric field equals current over area
Electric field equals potential times distance
Electric field equals force divided by test charge
Electric field equals charge divided by force
By definition, E = F/q, where F is the force on a small test charge q. This gives the electric field strength at that point. Other relations involve potential or current but not this direct definition.
What is the SI unit of capacitance?
Henry
Tesla
Siemens
Farad
Capacitance is measured in farads (F), defined as one coulomb per volt. Henries measure inductance, siemens measure conductance, and teslas measure magnetic flux density.
How much energy is stored in a capacitor with capacitance C and voltage V?
C V
½ C V²
½ CV
CV²
The energy (U) stored in a capacitor is given by U = ½ C V². This comes from integrating the work to charge the capacitor. Other expressions omit factors or square terms incorrectly.
Which statement best describes Kirchhoff's current law (KCL)?
The sum of currents entering a node equals the sum leaving
The sum of voltages around a loop is zero
Power in equals power out
Current times resistance equals voltage
Kirchhoff's current law states that the total current entering a junction equals the total current leaving it, reflecting charge conservation. The voltage law addresses loops.
What is the formula for the equivalent resistance of two resistors in parallel, R1 and R2?
R1^2 + R2^2
R1 R2
R1 + R2
1 / (1/R1 + 1/R2)
For parallel resistors, the inverse of the equivalent resistance equals the sum of inverses: 1/Req = 1/R1 + 1/R2. Series resistances add directly.
Which formula gives the electric power dissipated in a resistor?
P = R / I²
P = V / I
P = V × I
P = I² / R
Electric power is given by P = V × I. Using Ohm's law, this can also be P = I²R or P = V²/R, but the basic definition is voltage times current.
Drift velocity of charge carriers in a conductor is least influenced by which factor?
Cross-sectional area
Applied electric field
Color of the conductor
Charge carrier density
Drift velocity (v_d) = I/(nAq) depends on current I, carrier density n, cross-sectional area A, and charge q. The physical color of the metal has no effect on electron drift.
What is the potential energy U of two point charges q1 and q2 separated by distance r?
k r / (q1 q2)
k q1 / (q2 r)
k q1 q2 / r
k q1 q2 r
The electric potential energy between two charges is U = k q1 q2 / r, where k is Coulomb's constant. Other forms misplace charges or distance.
Introducing a dielectric material between capacitor plates will do what?
No effect on capacitance
Reverse the polarity
Decrease the capacitance
Increase the capacitance
A dielectric increases a capacitor's capacitance by reducing the effective electric field, allowing more charge storage for the same voltage. Its dielectric constant quantifies this effect.
What is the time constant ? of an RC circuit with resistance R and capacitance C?
R × C
R / C
C / R
1 / (R × C)
The RC time constant ? = R × C determines how quickly a capacitor charges or discharges. After time ?, the voltage reaches about 63% of its final value.
What does Gauss's law state about electric flux through a closed surface?
It depends only on the surface shape
It equals the enclosed charge divided by ??
It equals the electric field times area
It equals zero for any charge distribution
Gauss's law says the total electric flux through a closed surface is Q_enclosed/??. It's a fundamental Maxwell equation relating charge and field. Flux can be nonzero only if the surface encloses net charge.
How is the electric dipole moment defined for two equal and opposite charges?
Square of the charge times distance
Product of charges divided by distance
Charge magnitude times separation vector
Sum of the two charges
The dipole moment p = q·d, where q is the charge magnitude and d is the vector from negative to positive charge. It characterizes the separation of charges.
What term did Maxwell introduce to Ampère's law to account for time-varying electric fields?
Displacement current
Polarization density
Electromotive force
Magnetic monopole
Maxwell added the displacement current term ?? ?E/?t to Ampère's law to unify electricity and magnetism and allow for electromagnetic waves. Without it, the law fails for changing electric fields.
What phenomenon causes alternating current to concentrate near the surface of a conductor at high frequency?
Proximity effect
Photoelectric effect
Hall effect
Skin effect
The skin effect makes AC currents flow near the conductor's surface at high frequencies, reducing effective cross-sectional area and increasing resistance. It's due to induced magnetic fields opposing current in the interior.
What is the SI unit of inductance?
Tesla
Weber
Henry
Farad
Inductance is measured in henries (H). One henry is the inductance that induces 1 volt when current changes at 1 ampere per second. Farads measure capacitance, webers magnetic flux.
Which law states that the induced electromotive force opposes the change in magnetic flux?
Faraday's law
Gauss's law
Lenz's law
Ohm's law
Lenz's law describes the direction of induced EMF, stating it opposes the change in magnetic flux that produced it. Faraday's law gives the magnitude.
What is the relationship between the speed of light c and the vacuum permittivity ?? and permeability ???
c = ??/??
c = ?(?? ??)
c = 1/?(?? ??)
c = ?? ??
Maxwell's equations predict electromagnetic waves travel at c = 1/?(?? ??) in vacuum, linking electric and magnetic constants. This matches the measured speed of light.
What is the value of the vacuum permittivity ???
1.256 × 10^-6 H/m
6.022 × 10^23 mol^-1
3.00 × 10^8 m/s
8.854 × 10^-12 F/m
The vacuum permittivity ?? ? 8.854×10^-12 F/m determines the strength of electric field in vacuum. The permeability ?? is 4?×10^-7 H/m. Other constants do not match permittivity.
How are electrical conductivity ? and resistivity ? related?
? = ?²
? = 1/?
? = 1/??
? = ?
Conductivity is the reciprocal of resistivity: ? = 1/?. High resistivity means low conductivity and vice versa. This relation is fundamental in materials science.
What effect describes a voltage developed perpendicular to current flow in a conductor placed in a magnetic field?
Hall effect
Peltier effect
Seebeck effect
Skin effect
The Hall effect is the generation of a transverse voltage when a current-carrying conductor is in a perpendicular magnetic field. It's used for magnetic sensing.
Which differential equation relates electrostatic potential V to charge density ? in free space?
?·E = ?
?²V = -?/??
?²E = ???? ?²E/?t²
?×E = -?B/?t
Poisson's equation in electrostatics is ?²V = -?/??, linking potential to charge density. In charge-free regions it becomes Laplace's equation.
What boundary condition does Laplace's equation require on an equipotential surface?
Electric field is zero everywhere
Charge density is maximum
Electric potential is constant over the surface
Potential varies linearly
Laplace's equation solutions require that on an equipotential boundary the potential is constant. The normal derivative may be nonzero depending on field.
Under a Lorentz transformation, how do electric and magnetic fields mix between inertial frames?
Only E transforms, B stays constant
E transforms as E? = E/v and B? = B×v
Components transform according to E? = ?(E + v×B) and B? = ?(B - v×E/c²)
E and B remain invariant
Relativistic electrodynamics shows E and B fields mix under Lorentz boosts: E? = ?(E + v×B) and B? = ?(B - v×E/c²). This unifies electricity and magnetism.
Which quantum phenomenon explains electron emission from a metal under a strong electric field?
Thermionic emission
Auger effect
Quantum tunneling (field emission)
Photoelectric effect
Field emission arises when electrons quantum tunnel through a potential barrier under a strong electric field. It differs from photoelectric and thermionic processes.
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Study Outcomes

  1. Understand the fundamental nature of electricity -

    Grasp how electricity arises from the movement of charged particles and its role in powering circuits.

  2. Define electric current -

    Clarify what electric current is, identify charge carriers, and distinguish between conventional and electron flow.

  3. Apply knowledge to complete the phrase -

    Accurately fill in the blank "electricity is the flow of charged particles" to reinforce key terminology.

  4. Analyze electricity trivia questions -

    Examine thought-provoking science electricity test items to deepen your conceptual understanding.

  5. Complete the electricity quiz confidently -

    Use learned concepts to tackle the free electric current quiz and measure your comprehension.

  6. Evaluate the impact of charged particles -

    Assess how the movement of charges influences everyday electrical devices and systems.

Cheat Sheet

  1. Electricity is the Flow of Charged Particles -

    Electricity is the flow of charged particles - usually electrons - through a conductor, as defined by educational resources like MIT OpenCourseWare. This simple phrase helps you remember the fill-in-the-blank answer for "electricity is the _____ of charged particles" in any electricity quiz or science electricity test. Keep this core definition in mind when tackling electricity trivia questions or electric current quiz problems.

  2. Electric Current and the Ampere -

    Electric current (I) quantifies the rate of charge flow and is defined by the formula I = Q/t, where Q is charge in coulombs and t is time in seconds, as per SI standards. One ampere represents one coulomb per second, so a 2 A current corresponds to 2 C of charge passing a point each second. Visualize electrons streaming through a wire like water through a pipe to reinforce this concept during your electric current quiz.

  3. Coulomb's Law for Electrostatic Forces -

    Coulomb's law states that the force between two point charges is F = k·q₝·q₂/r², with k≈8.99×10❹ N·m²/C², as outlined by physics departments at major universities. This principle underlies electrostatic attraction and repulsion, crucial for answering electricity trivia questions about charged particle interactions. A quick mnemonic: "Force takes distance squared," to recall the r² in the denominator.

  4. Ohm's Law and Resistance -

    Ohm's law, V = I·R, relates voltage (V), current (I), and resistance (R), where resistance is measured in ohms (Ω), as detailed by the IEEE and many engineering syllabi. Use the Ohm's triangle (V at the top, I and R at the base corners) to quickly solve for any one variable if you know the other two. This formula is a staple of any electricity quiz or science electricity test question about circuit behavior.

  5. Series and Parallel Circuit Rules -

    In series circuits, current is constant while voltages add, whereas in parallel circuits, voltages remain constant and currents split, according to textbooks from institutions like Stanford University. For practice, draw simple circuit diagrams and label I₝, I₂, V₝, V₂ to see how values combine or divide. Mastering these rules boosts your confidence for electric current quizzes and electricity trivia questions.

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