Formula wheel 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 emf cosine equation audio engineering circle pie chart charge physics formula for power calc voltage bridging - sengpielaudio
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The Formula WheelFormulas 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 emf". E means also energy, so let's choose V.
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.
This includes also the connection from the
power amplifier to the speaker.
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
V = I × R              I = V ⁄ R              R = V ⁄ I
Electric power P = I × V      (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
P = I × V              I = P ⁄ V              V = P ⁄ I

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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