Week 9. basic electricity
● The Formula Wheel – Formulas of Electrical Engineering ●
for electric voltage
V,
current
I,
resistance
R, impedance
Z, power PMagic circle − Formulas for calculating any combination of electrical units
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| 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 AResistance 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
Electric voltage V = I × R (Ohm’s law formula)Electric voltage = amperage × resistance Please enter two values, the third value will be calculated.
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volts
amps 
ohmsBottom of Form
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Electric power P = I × V (Watt’s power law formula)Electric power = amperage × voltage Please enter two values, the third value will be calculated.
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watts
amps 
voltsBottom of Form
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“The Big Power Formulas”:Calculations: Power (watt), voltage, current, and resistance