1. What is Ohm's Law? Answer: Voltage (V) equals Current (I) multiplied by
Resistance (R): V = I × R
2. What is the unit of electrical resistance? Answer: Ohm (Ω)
3. What is the unit of electrical current? Answer: Ampere (A)
4. What is the unit of electrical voltage? Answer: Volt (V)
5. What is the unit of electrical power? Answer: Watt (W)
6. What is the formula for electrical power? Answer: Power (P) = Voltage
(V) × Current (I), or P = V × I
7. In a series circuit, what remains constant throughout? Answer: Current
remains constant throughout a series circuit
8. In a parallel circuit, what remains constant across all branches? Answer:
Voltage remains constant across all branches in a parallel circuit
9. What is the total resistance of two 10-ohm resistors connected in series?
Answer: 20 ohms (resistors add in series: R_total = R1 + R2)
10. What is the total resistance of two 10-ohm resistors connected in
parallel? Answer: 5 ohms (for equal resistors in parallel: R_total = R/n = 10/2
= 5 ohms)
11. What is an electrical conductor? Answer: A material that allows electric
current to flow easily through it (e.g., copper, aluminum)
12. What is an electrical insulator? Answer: A material that resists the flow
of electric current (e.g., rubber, plastic, glass)
13. What does AC stand for in electrical terms? Answer: Alternating Current
14. What does DC stand for in electrical terms? Answer: Direct Current
,15. What is the standard frequency of AC power in the United States?
Answer: 60 Hz (Hertz)
16. What is the standard residential voltage in the United States? Answer:
120/240 volts
17. What is a short circuit? Answer: An abnormal connection of low
resistance between two points of different potential in a circuit, causing
excessive current flow
18. What is an open circuit? Answer: A break in the electrical path that
prevents current from flowing
19. What is the purpose of a fuse? Answer: To protect a circuit by breaking
the connection when current exceeds a safe level
20. What is the purpose of a circuit breaker? Answer: To automatically
interrupt electrical flow when current exceeds a predetermined value, and can
be reset
21. What is the difference between series and parallel circuits? Answer:
Series circuits have one path for current flow; parallel circuits have multiple
paths for current flow
22. What is impedance? Answer: The total opposition to current flow in an
AC circuit, combining resistance and reactance
23. What is capacitance? Answer: The ability of a component to store
electrical charge, measured in Farads
24. What is inductance? Answer: The property of a conductor that opposes
changes in current flow, measured in Henrys
25. What is a capacitor? Answer: An electronic component that stores
electrical energy in an electric field
26. What is an inductor? Answer: A passive component that stores energy in
a magnetic field when current flows through it
27. What is a transformer? Answer: A device that transfers electrical energy
between circuits through electromagnetic induction, typically changing voltage
levels
28. What is the relationship between voltage, current, and power? Answer:
Power equals voltage multiplied by current (P = V × I)
, 29. What is a ground fault? Answer: An unintentional electrical path between
a power source and a grounded surface
30. What is the purpose of grounding in electrical systems? Answer: To
provide a safe path for fault current and prevent electric shock by connecting
equipment to earth
31. What is voltage drop? Answer: The reduction in voltage as current flows
through a conductor due to resistance
32. What is Kirchhoff's Current Law (KCL)? Answer: The sum of currents
entering a node equals the sum of currents leaving the node
33. What is Kirchhoff's Voltage Law (KVL)? Answer: The sum of all
voltages around a closed loop equals zero
34. What is RMS voltage? Answer: Root Mean Square voltage - the effective
value of AC voltage equivalent to DC voltage (approximately 0.707 times peak
voltage)
35. What is peak voltage? Answer: The maximum instantaneous voltage value
in an AC waveform
36. What is the wavelength of an electromagnetic wave? Answer: The
distance between successive peaks or troughs of the wave
37. What is the relationship between frequency and wavelength? Answer:
Wavelength = Speed of light / Frequency (inversely proportional)
38. What is a diode? Answer: A semiconductor device that allows current to
flow in only one direction
39. What is a transistor? Answer: A semiconductor device used to amplify or
switch electronic signals
40. What is an integrated circuit (IC)? Answer: A set of electronic circuits on
a small chip of semiconductor material
41. What is the purpose of a rectifier? Answer: To convert alternating current
(AC) to direct current (DC)
42. What is bandwidth? Answer: The range of frequencies that a system can
process or transmit
43. What is attenuation? Answer: The reduction in signal strength as it travels
through a medium
Resistance (R): V = I × R
2. What is the unit of electrical resistance? Answer: Ohm (Ω)
3. What is the unit of electrical current? Answer: Ampere (A)
4. What is the unit of electrical voltage? Answer: Volt (V)
5. What is the unit of electrical power? Answer: Watt (W)
6. What is the formula for electrical power? Answer: Power (P) = Voltage
(V) × Current (I), or P = V × I
7. In a series circuit, what remains constant throughout? Answer: Current
remains constant throughout a series circuit
8. In a parallel circuit, what remains constant across all branches? Answer:
Voltage remains constant across all branches in a parallel circuit
9. What is the total resistance of two 10-ohm resistors connected in series?
Answer: 20 ohms (resistors add in series: R_total = R1 + R2)
10. What is the total resistance of two 10-ohm resistors connected in
parallel? Answer: 5 ohms (for equal resistors in parallel: R_total = R/n = 10/2
= 5 ohms)
11. What is an electrical conductor? Answer: A material that allows electric
current to flow easily through it (e.g., copper, aluminum)
12. What is an electrical insulator? Answer: A material that resists the flow
of electric current (e.g., rubber, plastic, glass)
13. What does AC stand for in electrical terms? Answer: Alternating Current
14. What does DC stand for in electrical terms? Answer: Direct Current
,15. What is the standard frequency of AC power in the United States?
Answer: 60 Hz (Hertz)
16. What is the standard residential voltage in the United States? Answer:
120/240 volts
17. What is a short circuit? Answer: An abnormal connection of low
resistance between two points of different potential in a circuit, causing
excessive current flow
18. What is an open circuit? Answer: A break in the electrical path that
prevents current from flowing
19. What is the purpose of a fuse? Answer: To protect a circuit by breaking
the connection when current exceeds a safe level
20. What is the purpose of a circuit breaker? Answer: To automatically
interrupt electrical flow when current exceeds a predetermined value, and can
be reset
21. What is the difference between series and parallel circuits? Answer:
Series circuits have one path for current flow; parallel circuits have multiple
paths for current flow
22. What is impedance? Answer: The total opposition to current flow in an
AC circuit, combining resistance and reactance
23. What is capacitance? Answer: The ability of a component to store
electrical charge, measured in Farads
24. What is inductance? Answer: The property of a conductor that opposes
changes in current flow, measured in Henrys
25. What is a capacitor? Answer: An electronic component that stores
electrical energy in an electric field
26. What is an inductor? Answer: A passive component that stores energy in
a magnetic field when current flows through it
27. What is a transformer? Answer: A device that transfers electrical energy
between circuits through electromagnetic induction, typically changing voltage
levels
28. What is the relationship between voltage, current, and power? Answer:
Power equals voltage multiplied by current (P = V × I)
, 29. What is a ground fault? Answer: An unintentional electrical path between
a power source and a grounded surface
30. What is the purpose of grounding in electrical systems? Answer: To
provide a safe path for fault current and prevent electric shock by connecting
equipment to earth
31. What is voltage drop? Answer: The reduction in voltage as current flows
through a conductor due to resistance
32. What is Kirchhoff's Current Law (KCL)? Answer: The sum of currents
entering a node equals the sum of currents leaving the node
33. What is Kirchhoff's Voltage Law (KVL)? Answer: The sum of all
voltages around a closed loop equals zero
34. What is RMS voltage? Answer: Root Mean Square voltage - the effective
value of AC voltage equivalent to DC voltage (approximately 0.707 times peak
voltage)
35. What is peak voltage? Answer: The maximum instantaneous voltage value
in an AC waveform
36. What is the wavelength of an electromagnetic wave? Answer: The
distance between successive peaks or troughs of the wave
37. What is the relationship between frequency and wavelength? Answer:
Wavelength = Speed of light / Frequency (inversely proportional)
38. What is a diode? Answer: A semiconductor device that allows current to
flow in only one direction
39. What is a transistor? Answer: A semiconductor device used to amplify or
switch electronic signals
40. What is an integrated circuit (IC)? Answer: A set of electronic circuits on
a small chip of semiconductor material
41. What is the purpose of a rectifier? Answer: To convert alternating current
(AC) to direct current (DC)
42. What is bandwidth? Answer: The range of frequencies that a system can
process or transmit
43. What is attenuation? Answer: The reduction in signal strength as it travels
through a medium
