Basic Principles of Electric Circuits
Physics Formulary and Electricity Equations
Formula wheel
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Important formulas
Electrical engineering laws
Electronic engineering laws
Electrical formulas as circle diagram (pie chart)
The Formula Wheel of Electrical
Engineering
V comes from "voltage" and E from "electromotive force (emf)". E means also energy,
so we choose V.
Energy = voltage × charge. E = V × Q. Some like better to stick to E instead to V, so do
it. For R take Z.
The 12 most important Formulas:
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
