Direct current/Basics

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Basic Equations

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  • P, Power is measured in Watts
  • I, Current is represented in Amps
  • E, Voltage is measured in Volts
  • R, Resistance (and resistance potential) is measured in Ohms Ω
  • C, Capacitance amount of stored electric charge
  • P=IE ; Power= Current * Voltage
  • E=IR ; Voltage= Current * Resistance


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Voltage moves from the negative terminal to the positive terminal, but for application purposes it is viewed as positive to negative.

Ground in DC circuitry

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Although it may seem counter intuitive, according to electric voltage theory, the ground on a DC circuit is the negative terminal.


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