Introduction to Electricity
Understand the fundamentals of electricity, its principles, and applications. Ideal for beginners seeking to grasp essential concepts for further study in electrical engineering or related fields.
Safety First
🔹 What is Electricity?
⚡ Why Electrons Move and Create Current
⚡ What Voltage Really Is
⚡ What Electric Current Really Is
⚡ What Resistance Really Is
⚡ Why Metals Conduct and Insulation Doesn’t
⚡ How Circuits Work
⚡ Series vs. Parallel Circuits
⚡ Voltage Drop and Why It Matters
⚡ Loads vs. Switches
⚡ How Switches Control Current Flow
⚡ Real HVAC/R Examples: Motors, Contactors, and Transformers
⚡ Inductive vs. Resistive Loads
⚡ How Relays and Contactors Actually Work
⚡ How Transformers Step Voltage Up or Down
⚡ Why Motors Need Capacitors
⚡ How Magnetic Fields Create Motion in Motors
⚡ How PSC, Capacitor‑Start, and ECM Motors Work
⚡ Locked‑Rotor Amps and Motor Overheating
⚡ Why Motors Fail Electrically and Mechanically
⚡ How Compressors Use the Same Motor Principles
Current flow
Impedance
Like charges
Conductor
Symbol for current (I)
Semiconductor
Safety ground wire color
Electron charge
Resistance
Electrical Fundamentals Quiz
Power Calculations
Cooling Anticipation
Power Wire
Fuse sizing
Series Coils (24V)
Parallel heaters
Voltage Tolerance
Capacitor Rating
Bridge rectifier (center tap)
Transformer output side
Horsepower Conversion
Power, Voltage & Ohm’s Law Multiple Choice Questions
Resistance to limit current
Parallel resistance
Series voltage drops
Parallel resistance rule
Current increase
Parallel circuit voltage
Kilowatt conversion
Wi‑Fi thermostat communication
Capacitor analyzer
Transducer
Circuits & Components Quiz
Heating Anticipation
Three‑phase power
Wattage formula
Parallel voltage
Parallel resistors
ECM motors
Resistance formula
Voltage formula
Ohmmeter warning
Inductive load
Motors, Controls & Transformers Multiple‑Choice Questions
High‑Leg Voltage
Step‑Down Transformer
Step‑Up Transformer
Impedance Symbol (Z)
Clamp Meter on Both Wires
Inductive Reactance
Diode
Add‑A‑Wire Device
Advanced Electrical / HVAC Multiple‑Choice Questions