Jump to content

Direct current/Basics

From Wikiversity

Basic Equations

[edit | edit source]
  • 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

Theory

[edit | edit source]

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

[edit | edit source]

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

References

[edit | edit source]

Make: Electronics: Learning through discovery