Phase 2: AC, DC, Single-Phase & Three-Phase Systems
This phase contains 6 sections and 52 checklist topics. Use the interactive phase page to track your own learning progress.
2.1 DC
- What is DC?
- DC polarity
- Positive
- Negative
- Battery
- DC power supply
- SMPS
- 24 V DC
- And 1 more checklist topics
2.2 AC
- Alternating current
- Sine wave
- Positive half cycle
- Negative half cycle
- Frequency
- Amplitude
- Peak value
- RMS value
- And 1 more checklist topics
2.3 AC vs DC
- Differences
- Applications
- AC control circuits
- DC control circuits
- AC relay coil
- DC relay coil
- AC contactor coil
- DC contactor coil
2.4 Single Phase
- Line
- Neutral
- Earth
- Line-neutral voltage
- Single-phase loads
- Single-phase motor
- Single-phase protection
2.5 Three Phase
- Why three phase is used
- L1
- L2
- L3
- 120° phase displacement
- Phase sequence
- Phase rotation
- Line voltage
- And 5 more checklist topics
2.6 Star and Delta introduction
- Star connection
- Delta connection
- Line vs phase voltage
- Line vs phase current
- Why motors use star/delta
- Motor six terminals