**Important Electric Current MCQ Questions**

Electric Current MCQ Questions provide a comprehensive review of concepts related to electric current and its applications. You can pass initial tests of Physics electric current MCQ questions for PAF Logistics Branch, GD Pilots, PAF Air Defence Branch, PAF Admin & Special Duty Branch, and PAF Aeronautical Engineering Branch.

**Electric Current MCQs Questions (Part-1)**

**In a series circuit, the total resistance is equal to the ________ of individual resistances. **(sum)

**The relationship between voltage (V), current (I), and resistance (R) is given by ________. **(Ohm’s law)

**A device used to measure electric current is called a ________. **(ammeter)

**The unit of electric current is ________.** (ampere (A))

**When resistors are connected in parallel, the total resistance is ________ than the smallest resistance.** (less)

**The rate at which electrical energy is consumed in a circuit is called ________. **(power)

**The SI unit of power is ________. **(watt (W))

**When a circuit is closed, the electric current flows from the ________ terminal of the battery to the ________ terminal. **(positive, negative)

**A material that allows electric current to flow easily is called a ________. **(conductor)

**The potential difference across a resistor is also known as ________. **(voltage drop)

**The total resistance of resistors connected in parallel can be calculated using the formula ________. **(1/R_total = 1/R1 + 1/R2 + â€¦)

*Electric Current MCQs Questions (Part-2)*

**Kirchhoff’s ________ law states that the sum of currents entering a node is equal to the sum of currents leaving the node. **(current)

**The total power in a parallel circuit is equal to the ________ of power consumed by each individual resistor. **(sum)

**A ________ is a safety device that breaks the circuit when the current exceeds a certain value. **( circuit breaker)

**In an AC circuit, the current and voltage are ________ quantities that alternate in direction and magnitude.** (time-varying)

**Direct Current (DC) flows in ________ direction(s). **(one)

**Alternating Current (AC) periodically changes its ________ and ________. **(direction, magnitude)

**In a DC circuit, the current flows from the ________ terminal of the source to the ________ terminal. **(positive, negative)

**The frequency of AC is measured in ________. **(hertz (Hz))

**The standard frequency of AC in most countries is ________ Hz. **(50 or 60)

**The device used to convert AC to DC is called a ________.** (rectifier)

**The device used to convert DC to AC is called an ________. **(inverter)

**The waveform of AC is typically a ________ wave. **(sinusoidal)

**The voltage or current that reaches its maximum positive or negative peak in an AC waveform is called ________ value.** (peak)

*Electric Current MCQs Questions (Part-3)*

**The ________ value of an AC waveform is equal to the peak value divided by the square root of 2.** (RMS (Root Mean Square))

**The RMS value of a sinusoidal AC waveform is also known as its ________ value. **(effective)

**The ________ of an AC waveform refers to the number of complete cycles it completes in one second. **(frequency)

**The ________ of an AC waveform represents the time taken for one complete cycle. **(period)

**The average value of an AC waveform over a complete cycle is ________.** (zero)

**The symbol for DC in circuit diagrams is a straight line, while the symbol for AC is a ________ wave.** (wavy)

**The relationship between electric current and magnetism is described by ________.** (electromagnetism)

**The magnetic field produced by a current-carrying wire follows ________’s right-hand rule.** (AmpÃ¨re’s)

**The direction of the magnetic field around a current-carrying wire is ________ to the direction of the current.** (perpendicular)

**The SI unit of magnetic field strength is the ________. **(tesla (T))

**The strength of the magnetic field around a wire increases with ________ current or ________ distance from the wire. **(increasing, decreasing)

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*Electric Current MCQs Questions (Part-4)*

**The force experienced by a current-carrying wire in a magnetic field is given by ________’s law.** (Lorentz)

**The direction of the force on a current-carrying wire in a magnetic field depends on the ________ of the wire and the ________ of the magnetic field. **(directi**on, direction)**

**The device that utilizes the force between a current-carrying wire and a magnetic field to produce motion is called an ________. **(electric motor)

**The phenomenon of generating an electric current in a wire by moving it in a magnetic field is called ________. **(electromagnetic induction)

**According to Faraday’s law of electromagnetic induction, the magnitude of the induced current is directly proportional to the ________ of change in magnetic flux.** (rate)

**The device used to convert mechanical energy into electrical energy using electromagnetic induction is called a ________. **(generator)

**The direction of the induced current in a wire can be determined using ________’s right-hand rule. **(Faraday’s)

**The phenomenon of self-induction occurs when a changing ________ in a coil induces an electromotive force (EMF) in the same coil. **( current)

*Electric Current MCQs Questions (Part-5)*

**The process of adding an iron core to a coil to increase its inductance is called ________.** (magnetic coupling)

**The phenomenon of electromagnetic waves is based on the mutual ________ between electric and magnetic fields.** (interaction)

**________ is an essential consideration for working with electricity safely. **(Electrical safety)

**The process of connecting electrical devices to the Earth to prevent electrical shock is called ________.** (grounding)

**________ are devices used to protect electrical circuits from over currents and prevent electrical fires. **(Circuit breakers)

**The unit of electric current is the ________.** (ampere (A))

**________ is the flow of electric charge through a conductor.** (Electric current)

**The danger of ________ occurs when an electrical current passes through the body.** (electric shock)

**________ is the measure of the opposition to the flow of electric current in a material. **(Electrical resistance)

**Insulating materials, such as rubber or plastic, are used to prevent ________ in electrical systems.** (electric shock)

*Electric Current MCQs Questions (Part-6)*

**________ are devices used to protect against excessive current flow in electrical circuits.** (Fuses)

**When working on electrical circuits, it is important to ________ the power supply to prevent accidental electrical shock. **(disconnect)

**________ is the practice of using personal protective equipment (PPE) when working with electricity.** (Electrical safety gear)

**________ is the process of visually inspecting electrical equipment to identify potential hazards.** (Electrical equipment inspection.)

**________ is the practice of using electrically insulated tools when working with live circuits. **(Tool insulation)

**________ is a potential danger when electrical wires are frayed or damaged. **(Electric arcing)

**A ________ is an electrical device that measures the presence and intensity of an electric field. **(field detector)

**________ is the property of a material that opposes the flow of electric current. **(Electrical resistance)

**The unit of electrical resistance is the ________. **(ohm (Î©))

*Electric Current MCQs Questions (Part-7)*

**The formula ________ is used to calculate the resistance of a conductor. **(R = V/I)

**Materials with ________ resistivity have higher electrical resistance.** (higher)

**________ is the reciprocal of electrical resistance and is a measure of a material’s ease of conducting electric current. **(Electrical conductivity)

**The unit of electrical conductivity is ________ per meter (S/m).** (Siemens)

**________ materials have high electrical conductivity.** (Conducting)

**________ is a material with extremely low electrical conductivity.** (Insulator)

**The resistance of a wire is directly proportional to its ________ and inversely proportional to its ________.** (length, cross-sectional area)

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*Electric Current MCQs Questions (Part-8)*

**The resistance of a wire can be decreased by ________ its length or ________ its cross-sectional area. **(decreasing, increasing)

**________ is a phenomenon in which the resistance of a conductor increases with an increase in temperature. **(Temperature coefficient)

**The resistance of an ideal ________ remains constant regardless of temperature changes.** (superconductor)

**The ________ law states that the resistance of a conductor is directly proportional to its resistivity and length, and inversely proportional to its cross-sectional area. **(Ohm’s)

**The ________ of a material determines its ability to conduct electricity. **(atomic structure)

**________ is the measure of how well a material conducts electricity compared to the conductivity of copper.** (Relative conductivity)

**Kirchhoff’s laws are used to analyze ________ circuits.** (electrical)

**Kirchhoff’s ________ law states that the sum of currents entering a junction is equal to the sum of currents leaving the junction. **(current)

*Electric Current MCQs Questions (Part-9)*

**Kirchhoff’s ________ law states that the sum of potential differences (voltages) around any closed loop in a circuit is zero. **(voltage)

**In Kirchhoff’s voltage law, the algebraic sum of the ________ across the elements in a loop is zero. **(potential differences)

**Kirchhoff’s laws are based on the principles of ________ and conservation of energy. **(conservation)

**Kirchhoff’s ________ law is a consequence of the conservation of charge. **(current)

**In a series circuit, the current passing through each resistor is the ________. **(same)

**In a parallel circuit, the ________ across each branch is the same. **(voltage)

**When applying Kirchhoff’s laws, the ________ direction for currents and ________ polarities for voltages should be chosen.** (assumed, reference)

**The ________ loop rule is applied when analyzing circuits with multiple loops. **(Kirchhoff’s voltage)

**Kirchhoff’s laws are applicable to both ________ and ________ circuits. **(DC (direct current), AC (alternating current))

*Electric Current MCQs Questions (Part-10)*

**The ________ law allows us to calculate unknown currents in a circuit. **(Kirchhoff’s current)

**The ________ junction rule is applied when analyzing circuits with multiple junctions. **(Kirchhoff’s current)

**The algebraic sum of the currents entering a junction is equal to the ________ of the currents leaving the junction.** (sum)

**Kirchhoff’s laws provide a systematic method for solving complex ________ circuits. **(electrical)

**________ is the rate at which electrical energy is consumed or produced. **(Electrical power)

**The unit of electrical power is the ________. **(watt (W))

**The formula ________ is used to calculate electrical power. **(P = VI)

**________ is the unit of electrical energy. **(Joule (J))

**The formula ________ is used to calculate electrical energy. **(E = Pt)

**________ is the amount of electrical energy consumed by an electrical device in one hour.** (Kilowatt-hour (kWh))

*Electric Current MCQs Questions (Part-11)*

**The rate at which electrical energy is transferred is known as ________. **(power)

**The power consumed by a device can be calculated by dividing the ________ by the ________.** (energy, time)

**________ is the work done per unit charge in moving electric charges between two points. **(Electric potential)

**The ________ is the difference in electric potential between two points in an electrical circuit. **(voltage)

**The power consumed by a device can also be calculated by multiplying the ________ by the ________. **(current, voltage)

**The power loss in a circuit due to resistance is given by ________.** (P = I^2R)

**The ________ factor is the ratio of real power to apparent power in an AC circuit.** (power factor)

**________ is the energy stored in an electric field between two charged objects. **(Electric potential energy)

**The total power consumed in a circuit is equal to the ________ of power consumed by individual devices.** (sum.)

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