# Electricity and Electrical Circuits MCQs with Answers

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## Electricity and Electrical Circuits Online MCQs with Answers

What is the flow of electric charge called?
a) Current
b) Voltage
c) Resistance
d) Capacitance

a) Current

What is the SI unit of electric current?
a) Volt
b) Watt
c) Ampere
d) Ohm

c) Ampere

What is the relationship between current, voltage, and resistance in an electrical circuit?
a) Ohm’s law
b) Kirchhoff’s law
d) Gauss’s law

a) Ohm’s law

Which component in an electrical circuit stores and releases electrical energy?
a) Resistor
b) Capacitor
c) Inductor
d) Diode

b) Capacitor

Which material is commonly used as a conductor in electrical wires?
a) Plastic
b) Rubber
c) Copper
d) Glass

c) Copper

What is the term for a path that allows electric current to flow?
a) Circuit
b) Switch
c) Fuse
d) Battery

a) Circuit

What is the device used to measure electric current in a circuit?
a) Voltmeter
b) Ammeter
c) Multimeter
d) Oscilloscope

b) Ammeter

What is the term for a material that does not allow electric current to flow easily?
a) Conductor
b) Resistor
c) Insulator
d) Capacitor

c) Insulator

Which component is used to control the flow of current in an electrical circuit?
a) Resistor
b) Capacitor
c) Diode
d) Switch

d) Switch

What is the potential difference that causes electric charges to flow in a circuit?
a) Current
b) Resistance
c) Voltage
d) Power

c) Voltage

What is the SI unit of electric potential?
a) Ampere
b) Volt
c) Ohm
d) Watt

b) Volt

Which type of circuit has only one path for current to flow?
a) Series circuit
b) Parallel circuit
c) Complex circuit
d) Open circuit

a) Series circuit

What is the resistance of a circuit with a voltage of 12 volts and a current of 2 amperes?
a) 6 ohms
b) 8 ohms
c) 10 ohms
d) 24 ohms

a) 6 ohms

What happens to the resistance in a wire if its length is doubled while keeping its cross-sectional area constant?
a) Doubles
b) Halves
d) Remains the same

a) Doubles

What is the term for a circuit that is not complete and does not allow current to flow?
a) Open circuit
b) Closed circuit
c) Short circuit
d) Grounded circuit

a) Open circuit

What is the device used to protect an electrical circuit from excessive current?
a) Fuse
b) Switch
c) Resistor
d) Capacitor

a) Fuse

What is the relationship between power, voltage, and current in an electrical circuit?
a) Ohm’s law
b) Watt’s law
c) Kirchhoff’s law

b) Watt’s law

Which component is used to increase or decrease voltage in an electrical circuit?
a) Resistor
b) Capacitor
c) Transformer
d) Diode

c) Transformer

What is the term for the opposition to the flow of electric current in a circuit?
a) Voltage
b) Current
c) Resistance
d) Conductance

c) Resistance

Which type of circuit has multiple paths for current to flow?
a) Series circuit
b) Parallel circuit
c) Complex circuit
d) Open circuit

b) Parallel circuit

What is the term for a circuit that is complete and allows current to flow?
a) Open circuit
b) Closed circuit
c) Short circuit
d) Grounded circuit

b) Closed circuit

Which component in an electrical circuit restricts the flow of current?
a) Resistor
b) Capacitor
c) Inductor
d) Diode

a) Resistor

What is the device used to measure voltage in a circuit?
a) Voltmeter
b) Ammeter
c) Multimeter
d) Oscilloscope

a) Voltmeter

What is the term for the rate at which electric energy is transferred in a circuit?
a) Current
b) Resistance
c) Voltage
d) Power

d) Power

Which material is commonly used as an insulator in electrical wires?
a) Copper
b) Aluminum
c) Rubber
d) Glass

c) Rubber

What is the term for a wire that connects an electrical device to the ground?
a) Live wire
b) Neutral wire
c) Ground wire
d) Earth wire

c) Ground wire

Which device is used to measure the electrical resistance of a component?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Wattmeter

c) Ohmmeter

What is the term for the flow of electric charge in one direction only?
a) Direct current
b) Alternating current
c) Electric field
d) Magnetic field

a) Direct current

Which component is used to store and release electrical energy in an electrical circuit?
a) Resistor
b) Capacitor
c) Inductor
d) Diode

b) Capacitor

What is the term for a material that allows electric current to flow easily?
a) Conductor
b) Resistor
c) Insulator
d) Capacitor

a) Conductor

Which type of current frequently changes its direction?
a) Direct current
b) Alternating current
c) Electric current
d) Magnetic current

b) Alternating current

What is the device used to measure electrical resistance in a circuit?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Wattmeter

c) Ohmmeter

What is the term for the ratio of voltage to current in an electrical circuit?
a) Resistance
b) Conductance
c) Capacitance
d) Inductance

a) Resistance

Which component in an electrical circuit stores electrical energy in a magnetic field?
a) Resistor
b) Capacitor
c) Inductor
d) Diode

c) Inductor

What is the term for a circuit that has multiple branches for current to flow?
a) Series circuit
b) Parallel circuit
c) Complex circuit
d) Open circuit

c) Complex circuit

Which material is commonly used as a conductor in overhead power lines?
a) Aluminum
b) Copper
c) Steel
d) Silver

a) Aluminum

What is the device used to measure electrical power in a circuit?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Wattmeter

d) Wattmeter

What is the term for a circuit that provides an alternate path for current to flow?
a) Open circuit
b) Closed circuit
c) Short circuit
d) Grounded circuit

c) Short circuit

What is the rate at which electric charge flows in a circuit called?
a) Voltage
b) Current
c) Resistance
d) Conductance

b) Current

Which type of circuit has a single path for current to flow and shares the same current?
a) Series circuit
b) Parallel circuit
c) Complex circuit
d) Open circuit

a) Series circuit

What is the term for the opposition to the flow of electric current in a circuit?
a) Voltage
b) Current
c) Resistance
d) Conductance

c) Resistance

Which type of current changes its direction periodically?
a) Direct current
b) Alternating current
c) Electric current
d) Magnetic current

b) Alternating current

What is the device used to measure electrical current in a circuit?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Wattmeter

b) Ammeter

What is the term for a material that has a high resistance to the flow of electric current?
a) Conductor
b) Resistor
c) Insulator
d) Capacitor

b) Resistor

Which component is used to convert electrical energy into light?
a) Resistor
b) Capacitor
c) Inductor
d) Light-emitting diode (LED)

d) Light-emitting diode (LED)

What is the potential difference between two points in a circuit called?
a) Current
b) Resistance
c) Voltage
d) Power

c) Voltage

Which type of circuit has multiple paths for current to flow and shares the same voltage?
a) Series circuit
b) Parallel circuit
c) Complex circuit
d) Open circuit

b) Parallel circuit

What is the term for the flow of electric charge that periodically changes direction?
a) Direct current
b) Alternating current
c) Electric field
d) Magnetic field

b) Alternating current

Which device is used to protect an electrical circuit from excess voltage?
a) Fuse
b) Switch
c) Resistor
d) Capacitor

a) Fuse

What is the term for the electrical potential difference between two points in a circuit that is not connected to a power source?
a) Voltage
b) Current
c) Resistance
d) Potential difference

d) Potential difference

Which component is used to store electrical energy in a magnetic field?
a) Resistor
b) Capacitor
c) Inductor
d) Diode

c) Inductor

What is the device used to measure electric potential difference between two points in a circuit?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Wattmeter

a) Voltmeter

What is the term for the ratio of power output to power input in an electrical circuit?
a) Efficiency
b) Conductance
c) Capacitance
d) Inductance

a) Efficiency

Which component in an electrical circuit allows current to flow in only one direction?
a) Resistor
b) Capacitor
c) Diode
d) Transformer

c) Diode

What is the term for the opposition to the flow of electric current in a circuit?
a) Voltage
b) Current
c) Resistance
d) Conductance

c) Resistance

Which type of circuit has a break or gap that interrupts the flow of current?
a) Series circuit
b) Parallel circuit
c) Complex circuit
d) Open circuit

d) Open circuit

What is the term for the electrical pressure or force that causes current to flow in a circuit?
a) Current
b) Resistance
c) Voltage
d) Power

c) Voltage

Which component is used to store electrical energy in an electric field?
a) Resistor
b) Capacitor
c) Inductor
d) Diode

b) Capacitor

What is the term for a device that converts mechanical energy into electrical energy?
a) Motor
b) Generator
c) Transformer
d) Battery