)
300 QUESTIONS AND ANSWERS
1. What is electricity? Electricity is the flow of electric charge through a
conductor, typically electrons moving through a wire or circuit.
2. What is voltage? Voltage is the electrical pressure or potential difference
that causes a circuit's current flow, measured in volts (V).
3. What is current? Current is the flow of electric charge through a conductor,
measured in amperes (A) or amps.
4. What is resistance? Resistance is the opposition to the flow of electric
current, measured in ohms (Ω).
5. State Ohm's Law. Ohm's Law states that Voltage = Current × Resistance (V
= I × R).
6. What is power in electrical terms? Power is the rate at which electrical
energy is consumed or produced, measured in watts (W). P = V × I.
7. What is the difference between AC and DC? AC (Alternating Current)
changes direction periodically, while DC (Direct Current) flows in one direction
only.
8. What frequency is standard household AC power in the US? 60 Hz (60
cycles per second).
9. What is a conductor? A material that allows electric current to flow easily,
such as copper or aluminum.
10. What is an insulator? A material that resists the flow of electric current,
such as rubber, plastic, or glass.
11. What is grounding? Grounding is connecting electrical equipment to the
earth or a large conducting body to prevent electrical shock and equipment
damage.
,12. What is a short circuit? A short circuit occurs when current takes an
unintended path of low resistance, bypassing the normal load.
13. What is an open circuit? An open circuit is a break in the electrical path
that prevents current flow.
14. What is electrical continuity? Continuity means there is a complete,
unbroken path for current to flow in a circuit.
15. What is impedance? Impedance is the total opposition to current flow in an
AC circuit, including both resistance and reactance.
16. What is capacitance? Capacitance is the ability to store electrical charge,
measured in farads (F).
17. What is inductance? Inductance is the property of a conductor that opposes
changes in current flow, measured in henries (H).
18. What is a series circuit? A series circuit has components connected end-to-
end in a single path for current flow.
19. What is a parallel circuit? A parallel circuit has components connected
across common points, providing multiple paths for current flow.
20. What happens to voltage in a series circuit? In a series circuit, voltage
divides across each component proportionally to their resistance.
21. What happens to current in a parallel circuit? In a parallel circuit,
current divides among the parallel branches.
22. What is Kirchhoff's Voltage Law? The sum of all voltage drops in a
closed circuit loop equals the applied voltage.
23. What is Kirchhoff's Current Law? The sum of currents entering a
junction equals the sum of currents leaving that junction.
24. What is electromotive force (EMF)? EMF is the voltage generated by any
source of electrical energy, such as a battery or generator.
25. What is the right-hand rule in electricity? A rule used to determine the
direction of magnetic field around a current-carrying conductor.
26. What is electromagnetic induction? The process of generating voltage in a
conductor by changing the magnetic field around it.
27. What is a transformer? A device that changes AC voltage levels using
electromagnetic induction between coils.
, 28. What is the difference between step-up and step-down transformers?
Step-up transformers increase voltage, while step-down transformers decrease
voltage.
29. What is three-phase power? A system of AC power using three alternating
currents that are 120 degrees out of phase.
30. What is single-phase power? AC power delivered through two wires,
commonly used in residential applications.
31. What is neutral in electrical systems? The neutral conductor provides a
return path for current and is typically grounded.
32. What is the hot wire? The hot wire carries electrical current from the
source to the load.
33. What is electrical load? Any device or component that consumes electrical
power in a circuit.
34. What is a fuse? A protective device containing a metal strip that melts to
open a circuit when overcurrent occurs.
35. What is a circuit breaker? A protective device that automatically opens a
circuit when overcurrent is detected and can be reset.
36. What is overcurrent? Current flow that exceeds the rated capacity of a
circuit or component.
37. What is overload? Excessive current draw that exceeds normal operating
levels but is not a short circuit.
38. What is a ground fault? An unintentional connection between a hot
conductor and ground.
39. What is voltage drop? The reduction in voltage that occurs as current flows
through resistance in a circuit.
40. What is power factor? The ratio of real power to apparent power in an AC
circuit, indicating efficiency.
41. What is reactive power? Power consumed by inductive or capacitive loads
that doesn't perform useful work.
42. What is apparent power? The total power in an AC circuit, combining
both real and reactive power.
43. What is electrical energy? The capacity to do work, measured in kilowatt-
hours (kWh) for electrical billing.
300 QUESTIONS AND ANSWERS
1. What is electricity? Electricity is the flow of electric charge through a
conductor, typically electrons moving through a wire or circuit.
2. What is voltage? Voltage is the electrical pressure or potential difference
that causes a circuit's current flow, measured in volts (V).
3. What is current? Current is the flow of electric charge through a conductor,
measured in amperes (A) or amps.
4. What is resistance? Resistance is the opposition to the flow of electric
current, measured in ohms (Ω).
5. State Ohm's Law. Ohm's Law states that Voltage = Current × Resistance (V
= I × R).
6. What is power in electrical terms? Power is the rate at which electrical
energy is consumed or produced, measured in watts (W). P = V × I.
7. What is the difference between AC and DC? AC (Alternating Current)
changes direction periodically, while DC (Direct Current) flows in one direction
only.
8. What frequency is standard household AC power in the US? 60 Hz (60
cycles per second).
9. What is a conductor? A material that allows electric current to flow easily,
such as copper or aluminum.
10. What is an insulator? A material that resists the flow of electric current,
such as rubber, plastic, or glass.
11. What is grounding? Grounding is connecting electrical equipment to the
earth or a large conducting body to prevent electrical shock and equipment
damage.
,12. What is a short circuit? A short circuit occurs when current takes an
unintended path of low resistance, bypassing the normal load.
13. What is an open circuit? An open circuit is a break in the electrical path
that prevents current flow.
14. What is electrical continuity? Continuity means there is a complete,
unbroken path for current to flow in a circuit.
15. What is impedance? Impedance is the total opposition to current flow in an
AC circuit, including both resistance and reactance.
16. What is capacitance? Capacitance is the ability to store electrical charge,
measured in farads (F).
17. What is inductance? Inductance is the property of a conductor that opposes
changes in current flow, measured in henries (H).
18. What is a series circuit? A series circuit has components connected end-to-
end in a single path for current flow.
19. What is a parallel circuit? A parallel circuit has components connected
across common points, providing multiple paths for current flow.
20. What happens to voltage in a series circuit? In a series circuit, voltage
divides across each component proportionally to their resistance.
21. What happens to current in a parallel circuit? In a parallel circuit,
current divides among the parallel branches.
22. What is Kirchhoff's Voltage Law? The sum of all voltage drops in a
closed circuit loop equals the applied voltage.
23. What is Kirchhoff's Current Law? The sum of currents entering a
junction equals the sum of currents leaving that junction.
24. What is electromotive force (EMF)? EMF is the voltage generated by any
source of electrical energy, such as a battery or generator.
25. What is the right-hand rule in electricity? A rule used to determine the
direction of magnetic field around a current-carrying conductor.
26. What is electromagnetic induction? The process of generating voltage in a
conductor by changing the magnetic field around it.
27. What is a transformer? A device that changes AC voltage levels using
electromagnetic induction between coils.
, 28. What is the difference between step-up and step-down transformers?
Step-up transformers increase voltage, while step-down transformers decrease
voltage.
29. What is three-phase power? A system of AC power using three alternating
currents that are 120 degrees out of phase.
30. What is single-phase power? AC power delivered through two wires,
commonly used in residential applications.
31. What is neutral in electrical systems? The neutral conductor provides a
return path for current and is typically grounded.
32. What is the hot wire? The hot wire carries electrical current from the
source to the load.
33. What is electrical load? Any device or component that consumes electrical
power in a circuit.
34. What is a fuse? A protective device containing a metal strip that melts to
open a circuit when overcurrent occurs.
35. What is a circuit breaker? A protective device that automatically opens a
circuit when overcurrent is detected and can be reset.
36. What is overcurrent? Current flow that exceeds the rated capacity of a
circuit or component.
37. What is overload? Excessive current draw that exceeds normal operating
levels but is not a short circuit.
38. What is a ground fault? An unintentional connection between a hot
conductor and ground.
39. What is voltage drop? The reduction in voltage that occurs as current flows
through resistance in a circuit.
40. What is power factor? The ratio of real power to apparent power in an AC
circuit, indicating efficiency.
41. What is reactive power? Power consumed by inductive or capacitive loads
that doesn't perform useful work.
42. What is apparent power? The total power in an AC circuit, combining
both real and reactive power.
43. What is electrical energy? The capacity to do work, measured in kilowatt-
hours (kWh) for electrical billing.
