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Power in D.C. Circuits

Overview of Power in Electrical Circuits

  • Definition of Power:

    • Power is the energy transferred per unit time.

    • Measured in watts (W), where 1 W = 1 J/s (1 watt is 1 joule per second).

Calculating Power

  • Formula for Power:

    • P = V × I (Power = Voltage x Current)

      • P: Power in watts (W)

      • I: Current in amperes (A)

      • V: Potential difference in volts (V)

  • Power in D.C. Circuits:

    • Power is calculated using voltage and current values.

    • Resistors in series have the same current, while resistors in parallel share the same voltage.

Additional Notes

  • Power Calculation in AC Circuits:

    • In AC circuits, the power factor must be considered; this will be covered in advanced topics.

  • Alternative Power Calculation Methods:

    • Additional formula: P = V²/R (Power in terms of voltage and resistance)