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# Basic Electricity NABTEB past questions and answers

## Basic Electricity NABTEB past questions and answers

What does a voltmeter measure in an electrical circuit?

A) Voltage
B) Resistance
C) Current
D) Capacitance
What is the term used to describe the opposition to the flow of alternating current in a circuit?

A) Reactance
B) Resistance
C) Conductance
D) Impedance
Which law states that the total voltage in a series circuit is equal to the sum of individual voltages?

A) Ohm's Law
B) Kirchhoff's Voltage Law
C) Lenz's Law
What is the symbol for an alternating current source in a circuit diagram?

A) ◻
B) ⎓
C) ~
D) ↦
What device is used to protect sensitive electronic components from voltage spikes?

A) Fuse
B) Circuit Breaker
C) Surge Protector
D) Resistor
Which law states that the direction of induced current in a circuit opposes the change in magnetic field that produced it?

A) Kirchhoff's Law
B) Lenz's Law
D) Ampere's Law
What does a transformer do in an electrical system?

A) Increases resistance
B) Converts DC to AC
C) Changes voltage levels
D) Stores electrical energy
What is the role of a diode in an electrical circuit?

A) To store charge
B) To conduct electricity in both directions
C) To regulate voltage
D) To allow current flow in one direction
Answer: D) To allow current flow in one direction
Which component is used to smooth out variations in voltage in a circuit?

A) Capacitor
B) Resistor
C) Inductor
D) Transformer
What is the relationship between voltage, current, and resistance in a circuit according to Ohm's Law?

A) V = IR
B) I = VR
C) R = VI
D) V = I/R
Which material is often used as a semiconductor in electronic devices?

A) Copper
B) Aluminum
C) Silicon
D) Gold
What is the unit of magnetic flux?

A) Weber
B) Tesla
C) Henry
D) Gauss
Which device converts mechanical energy into electrical energy?

A) Capacitor
B) Transformer
C) Generator
D) Inductor
What does an oscilloscope measure in an electrical circuit?

A) Voltage
B) Current
C) Frequency
D) Waveforms
What is the unit of electrical conductance?

A) Ohm
C) Siemens
D) Weber
Which law states that the magnetic field induced around a current-carrying conductor is directly proportional to the current flowing through it?

A) Gauss's Law
B) Ampere's Law
C) Ohm's Law
What is the phenomenon where a material retains some magnetic properties after the magnetizing field is removed?

A) Induction
B) Hysteresis
C) Magnetization
D) Flux
What property of a circuit represents the opposition to the flow of alternating current due to capacitance and inductance?

A) Resistance
B) Reactance
C) Conductance
D) Impedance
Which component is used to increase or decrease the voltage in a circuit?

A) Resistor
B) Capacitor
C) Transformer
D) Inductor