BASIC ELECTRICAL THEORY EXAM COMPLETE
QUESTIONS AND CORRECT ANSWERS RECENTLY
UPDATED
300 QUESTIONS AND ANSWERS
1. Q: What is electricity? A: Electricity is the flow of electric charge, typically
through a conductor, caused by the movement of electrons.
2. Q: What is an electric charge? A: Electric charge is a fundamental property
of matter that causes it to experience a force in an electromagnetic field.
3. Q: What are the two types of electric charges? A: Positive charge and
negative charge.
4. Q: What is the basic unit of electric charge? A: The coulomb (C).
5. Q: What is an electron? A: An electron is a negatively charged subatomic
particle that orbits the nucleus of an atom.
6. Q: What is a proton? A: A proton is a positively charged subatomic particle
found in the nucleus of an atom.
7. Q: What is electric current? A: Electric current is the rate of flow of
electric charge through a conductor, measured in amperes (A).
8. Q: What is the symbol for electric current? A: The symbol for electric
current is "I".
9. Q: What is voltage? A: Voltage is the electric potential difference between
two points, measured in volts (V).
10. Q: What is the symbol for voltage? A: The symbol for voltage is "V" or
"E".
11. Q: What is resistance? A: Resistance is the opposition to the flow of
electric current in a material, measured in ohms (Ω).
,12. Q: What is the symbol for resistance? A: The symbol for resistance is
"R".
13. Q: State Ohm's Law. A: Ohm's Law states that V = I × R, where V is
voltage, I is current, and R is resistance.
14. Q: What is a conductor? A: A conductor is a material that allows electric
current to flow through it easily.
15. Q: Give three examples of good conductors. A: Copper, aluminum, and
silver.
16. Q: What is an insulator? A: An insulator is a material that resists the flow
of electric current.
17. Q: Give three examples of good insulators. A: Rubber, glass, and plastic.
18. Q: What is a semiconductor? A: A semiconductor is a material whose
electrical conductivity is between that of a conductor and an insulator.
19. Q: Name two common semiconductor materials. A: Silicon and
germanium.
20. Q: What is electric power? A: Electric power is the rate at which electrical
energy is transferred or consumed, measured in watts (W).
21. Q: What is the symbol for power? A: The symbol for power is "P".
22. Q: Write the formula for electrical power in terms of voltage and
current. A: P = V × I
23. Q: Write the formula for electrical power in terms of current and
resistance. A: P = I² × R
24. Q: Write the formula for electrical power in terms of voltage and
resistance. A: P = V²/R
25. Q: What is electrical energy? A: Electrical energy is the energy consumed
by an electrical device over time, measured in watt-hours (Wh) or kilowatt-
hours (kWh).
26. Q: How do you calculate electrical energy? A: Energy = Power × Time (E
= P × t)
, 27. Q: What is the difference between AC and DC? A: AC (Alternating
Current) changes direction periodically, while DC (Direct Current) flows in one
direction only.
28. Q: What is the standard frequency of AC power in most countries? A:
50 Hz or 60 Hz (50 Hz in most countries, 60 Hz in North America).
29. Q: What is an electric circuit? A: An electric circuit is a closed path
through which electric current can flow.
30. Q: What are the basic components needed for a complete circuit? A: A
voltage source, a load, and a complete conducting path.
31. Q: What is an open circuit? A: An open circuit is a circuit with a break in
the conducting path, preventing current flow.
32. Q: What is a short circuit? A: A short circuit is a low-resistance path that
allows current to bypass the intended load.
33. Q: What is Kirchhoff's Current Law (KCL)? A: KCL states that the sum
of currents entering a node equals the sum of currents leaving that node.
34. Q: What is Kirchhoff's Voltage Law (KVL)? A: KVL states that the sum
of voltage drops around any closed loop in a circuit equals zero.
35. Q: What is a node in an electrical circuit? A: A node is a point where two
or more circuit elements are connected.
36. Q: What is a branch in an electrical circuit? A: A branch is a path
connecting two nodes in a circuit.
37. Q: What is a loop in an electrical circuit? A: A loop is any closed path in
a circuit.
38. Q: What is ground in electrical circuits? A: Ground is a reference point in
a circuit, typically assigned zero voltage potential.
39. Q: What is the difference between conventional current and electron
flow? A: Conventional current flows from positive to negative, while electron
flow is from negative to positive.
40. Q: What is electromotive force (EMF)? A: EMF is the voltage generated
by a source of electrical energy, such as a battery or generator.
QUESTIONS AND CORRECT ANSWERS RECENTLY
UPDATED
300 QUESTIONS AND ANSWERS
1. Q: What is electricity? A: Electricity is the flow of electric charge, typically
through a conductor, caused by the movement of electrons.
2. Q: What is an electric charge? A: Electric charge is a fundamental property
of matter that causes it to experience a force in an electromagnetic field.
3. Q: What are the two types of electric charges? A: Positive charge and
negative charge.
4. Q: What is the basic unit of electric charge? A: The coulomb (C).
5. Q: What is an electron? A: An electron is a negatively charged subatomic
particle that orbits the nucleus of an atom.
6. Q: What is a proton? A: A proton is a positively charged subatomic particle
found in the nucleus of an atom.
7. Q: What is electric current? A: Electric current is the rate of flow of
electric charge through a conductor, measured in amperes (A).
8. Q: What is the symbol for electric current? A: The symbol for electric
current is "I".
9. Q: What is voltage? A: Voltage is the electric potential difference between
two points, measured in volts (V).
10. Q: What is the symbol for voltage? A: The symbol for voltage is "V" or
"E".
11. Q: What is resistance? A: Resistance is the opposition to the flow of
electric current in a material, measured in ohms (Ω).
,12. Q: What is the symbol for resistance? A: The symbol for resistance is
"R".
13. Q: State Ohm's Law. A: Ohm's Law states that V = I × R, where V is
voltage, I is current, and R is resistance.
14. Q: What is a conductor? A: A conductor is a material that allows electric
current to flow through it easily.
15. Q: Give three examples of good conductors. A: Copper, aluminum, and
silver.
16. Q: What is an insulator? A: An insulator is a material that resists the flow
of electric current.
17. Q: Give three examples of good insulators. A: Rubber, glass, and plastic.
18. Q: What is a semiconductor? A: A semiconductor is a material whose
electrical conductivity is between that of a conductor and an insulator.
19. Q: Name two common semiconductor materials. A: Silicon and
germanium.
20. Q: What is electric power? A: Electric power is the rate at which electrical
energy is transferred or consumed, measured in watts (W).
21. Q: What is the symbol for power? A: The symbol for power is "P".
22. Q: Write the formula for electrical power in terms of voltage and
current. A: P = V × I
23. Q: Write the formula for electrical power in terms of current and
resistance. A: P = I² × R
24. Q: Write the formula for electrical power in terms of voltage and
resistance. A: P = V²/R
25. Q: What is electrical energy? A: Electrical energy is the energy consumed
by an electrical device over time, measured in watt-hours (Wh) or kilowatt-
hours (kWh).
26. Q: How do you calculate electrical energy? A: Energy = Power × Time (E
= P × t)
, 27. Q: What is the difference between AC and DC? A: AC (Alternating
Current) changes direction periodically, while DC (Direct Current) flows in one
direction only.
28. Q: What is the standard frequency of AC power in most countries? A:
50 Hz or 60 Hz (50 Hz in most countries, 60 Hz in North America).
29. Q: What is an electric circuit? A: An electric circuit is a closed path
through which electric current can flow.
30. Q: What are the basic components needed for a complete circuit? A: A
voltage source, a load, and a complete conducting path.
31. Q: What is an open circuit? A: An open circuit is a circuit with a break in
the conducting path, preventing current flow.
32. Q: What is a short circuit? A: A short circuit is a low-resistance path that
allows current to bypass the intended load.
33. Q: What is Kirchhoff's Current Law (KCL)? A: KCL states that the sum
of currents entering a node equals the sum of currents leaving that node.
34. Q: What is Kirchhoff's Voltage Law (KVL)? A: KVL states that the sum
of voltage drops around any closed loop in a circuit equals zero.
35. Q: What is a node in an electrical circuit? A: A node is a point where two
or more circuit elements are connected.
36. Q: What is a branch in an electrical circuit? A: A branch is a path
connecting two nodes in a circuit.
37. Q: What is a loop in an electrical circuit? A: A loop is any closed path in
a circuit.
38. Q: What is ground in electrical circuits? A: Ground is a reference point in
a circuit, typically assigned zero voltage potential.
39. Q: What is the difference between conventional current and electron
flow? A: Conventional current flows from positive to negative, while electron
flow is from negative to positive.
40. Q: What is electromotive force (EMF)? A: EMF is the voltage generated
by a source of electrical energy, such as a battery or generator.
