Intermediate
4 lessons
140 min
AC and DC Electricity
Understand the difference between steady direct current and alternating current, read a sine wave correctly, calculate reactance and impedance, and analyse balanced three-phase power.
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What you will learn
- Describe the difference between DC and AC sources and loads
- Convert between peak, peak-to-peak and RMS values for a sine wave
- Calculate inductive and capacitive reactance and a series impedance
- Calculate active power in a balanced three-phase system
Prerequisites. Ohm’s law and series/parallel circuit analysis · Basic trigonometry: sine, cosine and the meaning of an angle · Familiarity with capacitor and inductor behaviour
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Course lessons
1
Direct Current Basics
Steady polarity and steady current, DC sources, resistive loads and the power relationships that apply to them...
30 min →
2
Alternating Current and Waveforms
Period, frequency, peak and RMS values, and why RMS is the value that predicts heating and power.
35 min →
3
Reactance and Impedance
Frequency-dependent opposition from inductors and capacitors, and how it combines with resistance in a series...
40 min →
4
Three-Phase Systems
Balanced three-phase supply, star and delta connections, line versus phase quantities and the three-phase powe...
35 min →