Direct current/Basics

Basic Equations

• 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

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

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

References

Make: Electronics: Learning through discovery