Voltage equals power divided by current (V = P/I). Example: 20W at 4A equals 5V
Current (I) equals power (P) divided by voltage (V). At 120V, 1W generates 0.008333A, 100W generates 0.8333A. At 240V, 1W generates 0.004167A, 100W generates 0.4167A
Power (kW) equals current (A) multiplied by voltage (V) divided by 1,000. Example: 12A at 120V equals 1.44kW
Conversion formula: A = W ÷ V for both DC and AC. Power formula: P = V × I. Current abbreviated as I, power abbreviated as P
Induction motor produces torque through electromagnetic induction from stator magnetic field. No electrical connections needed to rotor. Rotor can be wound type or squirrel-cage type
AC power is used in modern grids, while DC power powers batteries and solar panels. AC power is easier to transmit over long distances, while DC power is used in devices. AC devices use tilde (~) symbol, while DC devices use dotted line (⎓)