Currret electricity mcq with answers
Electric current is the flow of:
A. Electrons
B. Protons
C. Neutrons
D. Photons
Answer: A
The unit of electric current is:
A. Ampere
B. Volt
C. Ohm
D. Watt
Answer: A
Ohm’s law states that the current flowing through a conductor is directly proportional to the:
A. Voltage across the conductor
B. Resistance of the conductor
C. Power dissipated by the conductor
D. Temperature of the conductor
Answer: A
The device used to measure electric current is called a:
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Galvanometer
Answer: B
In a series circuit, the current:
A. Remains constant throughout the circuit
B. Varies depending on the resistance
C. Splits up between the branches
D. Adds up across the components
Answer: A
In a parallel circuit, the current:
A. Remains constant throughout the circuit
B. Varies depending on the resistance
C. Splits up between the branches
D. Adds up across the components
Answer: C
Kirchhoff’s current law states that the sum of currents entering a junction in a circuit is equal to the sum of currents:
A. Leaving the junction
B. Dissipated by the resistors
C. Entering the battery
D. Flowing through the capacitors
Answer: A
The resistance of a conductor depends on its:
A. Length
B. Diameter
C. Temperature
D. All of the above
Answer: D
The total resistance in a series circuit is equal to the:
A. Sum of the individual resistances
B. Average of the individual resistances
C. Product of the individual resistances
D. Reciprocal of the individual resistances
Answer: A
The total resistance in a parallel circuit is equal to the:
A. Sum of the individual resistances
B. Average of the individual resistances
C. Product of the individual resistances
D. Reciprocal of the individual resistances
Answer: D
The reciprocal of resistance is called:
A. Conductance
B. Capacitance
C. Inductance
D. Admittance
Answer: A
The power dissipated in a circuit can be calculated using the formula:
A. P = VI
B. P = V^2/R
C. P = I^2R
D. All of the above
Answer: D
The unit of electric power is the:
A. Ampere
B. Volt
C. Ohm
D. Watt
Answer: D
The electric power consumed by a device can be determined by measuring:
A. Voltage across the device
B. Current flowing through the device
C. Resistance of the device
D. All of the above
Answer: D
The electric power transmitted through a circuit can be minimized by reducing the:
A. Voltage
B. Current
C. Resistance
D. None of the above
Answer: B
The phenomenon in which a material allows the flow of electric current with little or no resistance is called:
A. Insulation
B. Superconductivity
C. Conductivity
D. Resistance
Answer: B
The device used to protect circuits from excessive current is called a:
A. Transformer
B. Capacitor
C. Resistor
D. Fuse
Answer: D
The device used to regulate voltage in a circuit is called a:
A. Transformer
B. Capacitor
C. Resistor
D. Voltage regulator
Answer: D
The direction of conventional current flow is:
A. From positive to negative
B. From negative to positive
C. Both directions simultaneously
D. None of the above
Answer : A
The device used to store electric charge is called a:
A. Capacitor
B. Inductor
C. Resistor
D. Transformer
Answer: A
The time required for a capacitor to charge or discharge to approximately 63.2% of its maximum voltage is known as:
A. Time constant
B. Charging time
C. Discharging time
D. Time delay
Answer: A
The property of an electric circuit that opposes changes in current is known as:
A. Capacitance
B. Resistance
C. Inductance
D. Conductance
Answer: C
The unit of electric charge is the:
A. Ampere
B. Volt
C. Coulomb
D. Ohm
Answer: C
The device used to measure electric potential difference is called a:
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Galvanometer
Answer : A
The relationship between electric current, voltage, and resistance is described by:
A. Ohm’s law
B. Faraday’s law
C. Newton’s law
D. Pascal’s law
Answer : A
The process of transferring electric charge from one object to another by direct contact is called:
A. Conduction
B. Induction
C. Radiation
D. Insulation
Answer: A
The process of transferring electric charge from one object to another without direct contact is called:
A. Conduction
B. Induction
C. Radiation
D. Insulation
Answer: B
The device used to increase or decrease the voltage in an electrical circuit is called a:
A. Transformer
B. Capacitor
C. Resistor
D. Transistor
Answer: A
The device used to protect sensitive electronic circuits from voltage spikes or surges is called a:
A. Capacitor
B. Transistor
C. Resistor
D. Surge protector
Answer: D
The phenomenon in which an electric current induces a magnetic field around a conductor is called :
A. Electromagnetism
B. Faraday’s law
C. Ampere’s law
D. Ohm’s law
Answer: A