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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
What is the SI unit of electric current?
a) Volt
b) Watt
c) Ampere
d) Ohm
What is the relationship between current, voltage, and resistance in an electrical circuit?
a) Ohm’s law
b) Kirchhoff’s law
c) Faraday’s law
d) Gauss’s law
Which component in an electrical circuit stores and releases electrical energy?
a) Resistor
b) Capacitor
c) Inductor
d) Diode
Which material is commonly used as a conductor in electrical wires?
a) Plastic
b) Rubber
c) Copper
d) Glass
What is the term for a path that allows electric current to flow?
a) Circuit
b) Switch
c) Fuse
d) Battery
What is the device used to measure electric current in a circuit?
a) Voltmeter
b) Ammeter
c) Multimeter
d) Oscilloscope
What is the term for a material that does not allow electric current to flow easily?
a) Conductor
b) Resistor
c) Insulator
d) Capacitor
Which component is used to control the flow of current in an electrical circuit?
a) Resistor
b) Capacitor
c) Diode
d) Switch
What is the potential difference that causes electric charges to flow in a circuit?
a) Current
b) Resistance
c) Voltage
d) Power
What is the SI unit of electric potential?
a) Ampere
b) Volt
c) Ohm
d) Watt
Which type of circuit has only one path for current to flow?
a) Series circuit
b) Parallel circuit
c) Complex circuit
d) Open 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
What happens to the resistance in a wire if its length is doubled while keeping its cross-sectional area constant?
a) Doubles
b) Halves
c) Quadruples
d) Remains the same
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
What is the device used to protect an electrical circuit from excessive current?
a) Fuse
b) Switch
c) Resistor
d) Capacitor
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
d) Faraday’s law
Which component is used to increase or decrease voltage in an electrical circuit?
a) Resistor
b) Capacitor
c) Transformer
d) 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
Which type of circuit has multiple paths for current to flow?
a) Series circuit
b) Parallel circuit
c) Complex circuit
d) Open 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
Which component in an electrical circuit restricts the flow of current?
a) Resistor
b) Capacitor
c) Inductor
d) Diode
What is the device used to measure voltage in a circuit?
a) Voltmeter
b) Ammeter
c) Multimeter
d) Oscilloscope
What is the term for the rate at which electric energy is transferred in a circuit?
a) Current
b) Resistance
c) Voltage
d) Power
Which material is commonly used as an insulator in electrical wires?
a) Copper
b) Aluminum
c) Rubber
d) Glass
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
Which device is used to measure the electrical resistance of a component?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Wattmeter
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
Which component is used to store and release electrical energy in an electrical circuit?
a) Resistor
b) Capacitor
c) Inductor
d) Diode
What is the term for a material that allows electric current to flow easily?
a) Conductor
b) Resistor
c) Insulator
d) Capacitor
Which type of current frequently changes its direction?
a) Direct current
b) Alternating current
c) Electric current
d) Magnetic current
What is the device used to measure electrical resistance in a circuit?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Wattmeter
What is the term for the ratio of voltage to current in an electrical circuit?
a) Resistance
b) Conductance
c) Capacitance
d) Inductance
Which component in an electrical circuit stores electrical energy in a magnetic field?
a) Resistor
b) Capacitor
c) Inductor
d) Diode
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
Which material is commonly used as a conductor in overhead power lines?
a) Aluminum
b) Copper
c) Steel
d) Silver
What is the device used to measure electrical power in a circuit?
a) Voltmeter
b) Ammeter
c) Ohmmeter
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
What is the rate at which electric charge flows in a circuit called?
a) Voltage
b) Current
c) Resistance
d) Conductance
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
What is the term for the opposition to the flow of electric current in a circuit?
a) Voltage
b) Current
c) Resistance
d) Conductance
Which type of current changes its direction periodically?
a) Direct current
b) Alternating current
c) Electric current
d) Magnetic current
What is the device used to measure electrical current in a circuit?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Wattmeter
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
Which component is used to convert electrical energy into light?
a) Resistor
b) Capacitor
c) Inductor
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
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
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
Which device is used to protect an electrical circuit from excess voltage?
a) Fuse
b) Switch
c) Resistor
d) Capacitor
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
Which component is used to store electrical energy in a magnetic field?
a) Resistor
b) Capacitor
c) Inductor
d) Diode
What is the device used to measure electric potential difference between two points in a circuit?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Wattmeter
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
Which component in an electrical circuit allows current to flow in only one direction?
a) Resistor
b) Capacitor
c) Diode
d) 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
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
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
Which component is used to store electrical energy in an electric field?
a) Resistor
b) Capacitor
c) Inductor
d) Diode
What is the term for a device that converts mechanical energy into electrical energy?
a) Motor
b) Generator
c) Transformer
d) Battery
What is the term for the flow of electric charge that occurs in one direction only?
a) Direct current
b) Alternating current
c) Electric field
d) Magnetic field