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On this page
  • AC vs DC
  • PSU steps
  1. hardware

Power

Explaining what a PSU does and the measurement units

Voltage (V): The electrical potential difference. It’s the force that pushes electric charges through a circuit.

Example: A standard wall outlet in many countries provides about 120V or 230V AC.

Current (I): The flow of electric charge, measured in Amperes (A or Amps).

Example: A device might draw 2A of current from the power source.

Power (P): The rate at which electrical energy is consumed or generated, measured in Watts (W). It is calculated as:

P = V x I

(P=120V×2A=240W)

AC vs DC

Feature
AC
DC

Direction

Alternates periodically

Flows in one direction only

Waveform

Sine wave (usually)

Constant (flat line)

Frequency

Measured in Hertz (Hz)

No frequency; steady flow

PSU steps

  • Input: The PSU draws 120V AC and 1.5A, consuming 180W of power.

  • Rectification: AC is converted to pulsating DC.

  • Filtering/Regulation: The output voltage is regulated to a stable 12V DC.

  • Output: The PSU provides up to 10A at 12V, resulting in a maximum power output of 120W.

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