CETa (Certified Electronics Technician –
Associate) study guide updated for
the 2026/2027 syllabus
Question text
ANSWER ✓ (correct answer)
The questions cover DC/AC circuits, semiconductors, digital electronics,
troubleshooting, safety, soldering, test equipment, and more — reflecting the latest
ETA-I CETa body of knowledge.
DC Circuits (1–15)
1. What is the unit of electrical resistance?
ANSWER ✓ Ohm
2. A resistor has color bands: Yellow, Violet, Orange, Gold. What is its nominal value and
tolerance?
ANSWER ✓ 47 kΩ ±5%
3. If 3 coulombs of charge pass a point in 6 seconds, what is the current?
ANSWER ✓ 0.5 A
4. State Ohm’s law.
ANSWER ✓ V = I × R
5. A 10 Ω resistor has 5 A through it. What is the voltage across it?
ANSWER ✓ 50 V
6. Two 12 Ω resistors in parallel have what equivalent resistance?
ANSWER ✓ 6 Ω
7. A 9 V battery supplies 0.5 A to a load. What is the load’s resistance?
ANSWER ✓ 18 Ω
8. Three resistors (2 Ω, 3 Ω, 5 Ω) in series: find total resistance.
ANSWER ✓ 10 Ω
9. What is Kirchhoff’s Current Law (KCL)?
ANSWER ✓ Sum of currents entering a node equals sum leaving it
10. What is Kirchhoff’s Voltage Law (KVL)?
ANSWER ✓ Sum of voltages around a closed loop equals zero
, 11. A 100 Ω resistor dissipates 0.25 W. What is the current through it?
ANSWER ✓ 0.05 A (50 mA)
12. What happens to total resistance if you add more resistors in parallel?
ANSWER ✓ It decreases
13. A 220 Ω resistor and a 330 Ω resistor in parallel: equivalent resistance approx?
ANSWER ✓ 132 Ω
14. Power formula involving I and R.
ANSWER ✓ P = I² × R
15. A device draws 2 A at 24 V. Power consumed?
ANSWER ✓ 48 W
AC Circuits (16–30)
16. What is the peak voltage of 120 V RMS AC?
ANSWER ✓ ≈169.7 V
17. Define frequency.
ANSWER ✓ Cycles per second (Hz)
18. What is capacitive reactance (Xc) formula?
ANSWER ✓ Xc = 1 / (2πfC)
19. A 60 Hz AC signal has what period?
ANSWER ✓ 16.67 ms
20. In a purely inductive circuit, current lags voltage by how many degrees?
ANSWER ✓ 90°
21. True power in an AC circuit equals:
ANSWER ✓ V × I × power factor
22. What does a capacitor do to DC after fully charging?
ANSWER ✓ Blocks DC (acts as open circuit)
23. An inductor passes DC easily but opposes:
ANSWER ✓ Changes in current
24. What is the unit of inductance?
ANSWER ✓ Henry (H)
25. A transformer’s primary has 100 turns, secondary 50 turns. Primary voltage 120 V AC.
Secondary voltage?
ANSWER ✓ 60 V AC
26. What is power factor?
ANSWER ✓ Cosine of phase angle between voltage and current
Associate) study guide updated for
the 2026/2027 syllabus
Question text
ANSWER ✓ (correct answer)
The questions cover DC/AC circuits, semiconductors, digital electronics,
troubleshooting, safety, soldering, test equipment, and more — reflecting the latest
ETA-I CETa body of knowledge.
DC Circuits (1–15)
1. What is the unit of electrical resistance?
ANSWER ✓ Ohm
2. A resistor has color bands: Yellow, Violet, Orange, Gold. What is its nominal value and
tolerance?
ANSWER ✓ 47 kΩ ±5%
3. If 3 coulombs of charge pass a point in 6 seconds, what is the current?
ANSWER ✓ 0.5 A
4. State Ohm’s law.
ANSWER ✓ V = I × R
5. A 10 Ω resistor has 5 A through it. What is the voltage across it?
ANSWER ✓ 50 V
6. Two 12 Ω resistors in parallel have what equivalent resistance?
ANSWER ✓ 6 Ω
7. A 9 V battery supplies 0.5 A to a load. What is the load’s resistance?
ANSWER ✓ 18 Ω
8. Three resistors (2 Ω, 3 Ω, 5 Ω) in series: find total resistance.
ANSWER ✓ 10 Ω
9. What is Kirchhoff’s Current Law (KCL)?
ANSWER ✓ Sum of currents entering a node equals sum leaving it
10. What is Kirchhoff’s Voltage Law (KVL)?
ANSWER ✓ Sum of voltages around a closed loop equals zero
, 11. A 100 Ω resistor dissipates 0.25 W. What is the current through it?
ANSWER ✓ 0.05 A (50 mA)
12. What happens to total resistance if you add more resistors in parallel?
ANSWER ✓ It decreases
13. A 220 Ω resistor and a 330 Ω resistor in parallel: equivalent resistance approx?
ANSWER ✓ 132 Ω
14. Power formula involving I and R.
ANSWER ✓ P = I² × R
15. A device draws 2 A at 24 V. Power consumed?
ANSWER ✓ 48 W
AC Circuits (16–30)
16. What is the peak voltage of 120 V RMS AC?
ANSWER ✓ ≈169.7 V
17. Define frequency.
ANSWER ✓ Cycles per second (Hz)
18. What is capacitive reactance (Xc) formula?
ANSWER ✓ Xc = 1 / (2πfC)
19. A 60 Hz AC signal has what period?
ANSWER ✓ 16.67 ms
20. In a purely inductive circuit, current lags voltage by how many degrees?
ANSWER ✓ 90°
21. True power in an AC circuit equals:
ANSWER ✓ V × I × power factor
22. What does a capacitor do to DC after fully charging?
ANSWER ✓ Blocks DC (acts as open circuit)
23. An inductor passes DC easily but opposes:
ANSWER ✓ Changes in current
24. What is the unit of inductance?
ANSWER ✓ Henry (H)
25. A transformer’s primary has 100 turns, secondary 50 turns. Primary voltage 120 V AC.
Secondary voltage?
ANSWER ✓ 60 V AC
26. What is power factor?
ANSWER ✓ Cosine of phase angle between voltage and current
