How to calculate stress in physics
and electrical voltage
electricity and electric charge
The most common general formulas in electrical engineering
● Formulas and Calculations ●
context the physical and electrical quantities (Parameters)
Electric voltageU,AmperageI.,resistanceR., ImpedanceZ, powerP
voltin V,ampin A,resistance and Impedance in ohm Ω andwatt in W
In physics we speak of electrical voltage and electrical current as the strength of the current. How do I calculate the voltage? Avoid the weird wrong word Voltage, that tour operators and lawyers like to use and replace with one of the following Words: electrical voltage, operating voltage or mains voltage. Practitioners rarely speak of the Potential difference, when simply electrical voltage is meant. Even if the last name of the namesake "Ampère" is written with accent grave, The SI unit in the German and Englishspeaking countries is written without an accent, ie "Ampere". 
For the resistance R. often becomes the nominal impedance Z = 4, 8 and 16 ohms assumed (loudspeaker) The impedance is the alternating current resistance, which consists of the components capacitor, coil and ohmic resistance is formed and its value and phase position changes with frequency. Ohm's law U = R · I. or Ohm's law including power P = U · I; P = power. I. = international ampere, intensity or Latin influare (to flow in), E. = electromotive force (EMF) and R. = resistance. U comes from the Latin urgere (urge, drive, press). U is supposed also mean "difference" because of the potential difference as a difference or also as a voltage drop. If you don't like the vile word voltage, you can also use voltage in a very elegant way (electrical) Call the potential difference. The letter I. can come from "International Ampere", but also from lat. influare (flow in) come and R. of resistance or of resistare (to resist). Formulas: URI and PUI. 
Please enter two values  the other two values are calculated. 

In English is U not known for tension. There you know "voltage" = V or E. by "electro motive force" Energy = tension · Charge. E. = U · Q. For the resistance R. is also the impedance Z to take. 
The 12 most important formulas: tension U = R.·I. = P / I. = √(P·R.) in volts V amperage I. = U / R. = P / U = √(P / R.) in ampere A resistance R. = U / I. = P / I.^{2} = U^{2} / Pin Ohm Ω power P = U·I. = R.·I.^{2} = U^{2}/ R. in watt W 
The big ones Performance formulas or, more contemporary, "The Mega Power Formulas"  Electrical and mechanical power calculation (strength) 

AndréMarie Ampère was a French physicist and mathematician. The SI unit of measurement of electrical current in amp, was named after him. Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist. The SI unit of measurement of electrical voltage in volt, was named after him. Georg Simon Ohm was a German physicist and mathematician. The SI unit of measurement of electrical resistance in ohm, was named after him. James Watt was a Scottish inventor and mechanical engineer. The SI unit of measurement of electrical power in watt, was named after him. 
Power, like all energy quantities, is predominantly a calculated quantity. 
The word "power amplifier" is incorrect  especially in audio engineering. Voltage and current can be amplified. The term "power amplifier" is strange, but it means that an amplifier should drive a load  like a loudspeaker. We call the product of the current and voltage gain simply "Power Boost". 
Apparent power = √ (active line^{2} + Reactive power^{2}) 
Tip: The triangle of electrical voltage U = R. · I. (Ohm's Law URI)
You're welcome two Enter values, the third value will be calculated.
Tip: The triangle of electrical power P = U · I. (PUI benefit law)
You're welcome two Enter values, the third value will be calculated.
A "magic triangle" can be used to calculate all formulas quite easily.
The value to be calculated is covered. The result is calculated with the other two values.
Calculations: Ohm's law  The magic triangle
ALTERNATING CURRENT (AC) ~
U_{l} = Mains voltage (volts), U_{p} = Phase voltage (volts), I._{l} = Mains current (amps), I._{p} = Phase amperage (amperes)
Z = Impedance (ohms), P = Power (watt) φ = Power factor (angle), VAR = voltampere (reactive)
Amperage (single phase): I. = P / U· cos φ  Current strength (3 phases): I. = P / √3 U_{l}· cos φ or I. = P / 3 U· cos φ 
Performance (single phase): P = U_{p}·I._{p} · cos φ  Performance (3 phases): P = √3 U_{l}·I._{l}· cos φ or P = √ 3 U_{p}·I._{p} · cos φ 
The term cos φ is called power factor, active factor or displacement factor. This is
the quotient of active and apparent power (cos φ = P / S) or the cosine of the phase shift.
The apparent power S. is calculated according to Pythagoras from the active power P and reactive power Q. S. = √(P^{2} + Q^{2})
DC power formulas Stress calculation U in (V) from amperage I. in (A) and resistance R. in (Ω): U_{(V)} = I._{(A)} × R._{(Ω)} The performance calculation P in (W) from voltage U in volts (V) and amperage I. in (A): P_{(W)} = U_{(V)} ×I._{(A)} = U^{2}_{(V)} / R._{(Ω)} = I.^{2}_{(A)} × R._{(Ω)} AC power formulas The voltage U in volts (V) is equal to the current strength I. in amps (A) times the impedance Z in Ohm (Ω): U_{(V)} = I._{(A)} × Z_{(Ω)} = ( I.  ×  Z ) and (θ_{I.} + θ_{Z}) The apparent power S. in voltamperes (VA) is equal to the voltage U in volts (V) times the current I. in ampere (A): S._{(VA)} = U_{(V)} × I._{(A)} = ( U  ×  I. ) and (θ_{V} − θ_{I.}) The real powerP in watts (W) is equal to the voltage U in volts (V) times the current I. in amps (A) times the power factor (cos φ): P_{(W)} = U_{(V)} × I._{(A)} × cos φ The reactive power Q in voltsamperes reactive (VAR) is equal to the voltage U in volts (V) times the Amperage I. in amperes (A) times the sine of the complex power phase angle (φ): Q_{(VAR)} = V_{(V)} × I._{(A)} × sin φ The power factor (FP) is equal to the absolute value of the cosine of the complex Power phase angle (φ): PF =  cos φ  
quantity  Surname  definition 
frequency f  Hertz (Hz)  1 / s 
force F.  Newton (N)  kg·m / s² 
print p  Pascal (Pa) = N / m²  kg / m·s² 
energy E.  Work Joule (J) = N·m  kg·m² / s² 
power P  Watt (W) = J / s  kg·m² / s³ 
Electric charge Q  Coulomb (C) = A·s  A.·s 
tension U  Volts (V) = W / A  kg·m² / A·s³ 
electricity I.  Amps (A) = Q / s  A. 
capacity C.  Farad (F) = C / V = A·s / V = s / Ω  A²·s^{4}/ kg·m² 
Inductance L.  Henry (H) = Wb / A = V·s / A  kg·m² / A²·s² 
resistance R.  Ohm (Ω) = V / A  kg·m²A²·s³ 
conductivity G  Siemens (S) = A / V  A²·s³ / kg·m² 
Magnetic flux Φ  Weber (Wb) = V·s  kg·m² / A·s² 
Flux density B.  Tesla (T) = Wb / m² = V·s / m²  kg / A·s² 
The flow of electrical charge Q is called electric current I. designated. The change in the amount of charge per The unit of time is the electrical current strength. A current flows with constant strength I. During the time tso he transports the charge Q = I · t. For a current that is constant over time, the relationship between charge and current is: I = Q / t or Q = I · t. Because of this relationship of the base units amps and seconds, the coulomb is in internationals System of units specified. The unit Coulomb can be expressed as 1 C = 1 A. · s represent. charge Q, (Unit in amperehours Ah), discharge current I., (Unit in ampere A), time t, (Unit in hours h). 
The acoustic equivalence to Ohm's law (calculator)
This applies to acoustics acoustic equivalent to Ohm's law
Relationship of the acoustic quantities in the case of flat, progressing sound waves
Conversions of other units, such as power and energy
Prefixes  Length  Area  Volume  Weight  Pressure  Temperature  Time  energy  power  Density  Speed  Acceleration  force
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