Formula wheel of the electrical engineering power wheel electricity ohm's law pie chart calculation electric power formula general audio physics electricity electronics formula wheel formulas amps watts volts law ohms cosine equation audio engineering circle pie chart charge physics formula for power calc - sengpielaudio
 
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The Formula Wheel − Formulas of Electrical Engineering  
for electric voltage V, current I, resistance R, impedance Z, power P
Magic circle − Formulas for calculating any combination of electrical units
 
Principles of Electrical Engineering
Physics Formulary and Electricity Equations
 
 Formula Wheel  Important Formulas
Electrical engineering laws   Electronic engineering laws
Electrical formulas as circle diagram (pie chart)
 
Formula wheel electronics
 
V comes from "voltage" and E from "electromotive force". E means also energy, so V is chosen.
Energy = voltage × charge. E = V × Q. Some like better to stick to E instead to V, so do it.
 
Voltage V = I × R = P / I = √(P × R) in volts V          Current I = V / R = P / V = √(P / R) in amperes A
Resistance R = V / I = P / I2 = V2 / P in ohms Ω      Power P = V × I = R × I2 = V2 / R in watts W
 
Electric current, electric power, electricity − Formulas and calculations
 
See also: The formula wheel of acoustics (audio)
 
Acoustics, sound, and vibrations − Acoustic equivalent for ohm's law 

 
In sound engineering there is no Power matching or Impedance matching.
In audio we use only
Voltage bridging or high Impedance bridging Zout < Zin.
 
 
Electric voltage V = I × R      (Ohm's law formula)
Electric voltage = amperage × resistance
 
Please enter two values, the third value will be calculated.

 Electric voltage V  volts Magic triangle volt
Amperage I  amps 
Resistance R  ohms
Electric power P = V × I      (Watt's power law formula)
Electric power = amperage × voltage
 
Please enter two values, the third value will be calculated.

  Electric Power P  watts Magic triangle volt
Amperage I  amps 
Voltage V  volts 

If the unit of power P = I × V and of voltage V = I · R is needed
look for Red Power Dot "The Big Power Formulas":
Calculations: Power (watt), voltage, current, and resistance

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