Electrical calculations
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Deutsche Version
• Formulas and calculation •
Electricity
Electrical voltage V, current I, resistance R, (impedance) Z, power P
The nominal impedance Z = 4, 8, and 16 ohms (loudspeakers) is often assumed as resistance R.Ohm's law equation (formula): E = R × I and the power law equation (formula): P = E × I, P = power,I = intensity, E = electro motive force (EMF = voltage), V = voltage, electric potential difference, R = resistance.Enter any TWO of the following values and click on the calculation button.The missing values will be calculated. Enter only two values.
voltage E or V =
volts V
current I =
amperes, amps A
resistance R =
ohms Ω
power P =
watts W
Formula wheel
Important formulas
electro techniques
electronics
V comes from "voltage" and E from "electromotive force". E means also energy, so V is chosen.
The Big Power Formulas
Electrical and mechanical power calculation
Formula 1 - Electrical (electric) power equation: P = V × I where power P is in watts, voltage V is in volts and current I is in amperes (DC). If there is AC, look also at the phase factor PF = cos φ and φ = power factor (angle) between voltage and amperage. Formula 2 - Mechanical (mechanic) power equation: P = E / t where power P is in watts, energy E is in joules, and time t is in seconds. 1 W = 1 J/s. Undistorted powerful sound is barely to find in these formulas. Watch your ears! Electric (electrical) energy is E = P × t - measured in watthours, or also in kWh.
Tip: The electrical power triangle (power formula)
The magic triangle can be used to calculate all formulas of the "electric power law". You hide witha finger the value to be calculated. The other two values show then how to do the calculation.
Calculations: Ohm's law - Ohm's magic triangle
•
ALTERNATING CURRENT (AC) ~
Vl = line voltage (volts), Vp = phase voltage (volts), Il = line current (amps), Ip = phase current (amps)Z = impedance (ohms), P = power (watts), φ = power factor (angle), VAR = volt-amperes (reactive)
Current (single phase): I = P / Vp×cos φ Current (3 phase): I = P / √3 Vl×cos φ or I = P / 3 Vp×cos φPower (single phase): P = Vp×Ip×cos φ Power (3 phase): P = √3 Vl×Il×cos φ or P = √3 Vp×Ip×cos φPhase factor PF = cos φ and φ = power factor (angle)
Conversions of more different units:
prefixes length area volume weight pressure temperature time energy power density velocity acceleration force
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Deutsche Version
• Formulas and calculation •
Electricity
Electrical voltage V, current I, resistance R, (impedance) Z, power P
The nominal impedance Z = 4, 8, and 16 ohms (loudspeakers) is often assumed as resistance R.Ohm's law equation (formula): E = R × I and the power law equation (formula): P = E × I, P = power,I = intensity, E = electro motive force (EMF = voltage), V = voltage, electric potential difference, R = resistance.Enter any TWO of the following values and click on the calculation button.The missing values will be calculated. Enter only two values.
voltage E or V =
volts V
current I =
amperes, amps A
resistance R =
ohms Ω
power P =
watts W
Formula wheel
Important formulas
electro techniques
electronics
V comes from "voltage" and E from "electromotive force". E means also energy, so V is chosen.
The Big Power Formulas
Electrical and mechanical power calculation
Formula 1 - Electrical (electric) power equation: P = V × I where power P is in watts, voltage V is in volts and current I is in amperes (DC). If there is AC, look also at the phase factor PF = cos φ and φ = power factor (angle) between voltage and amperage. Formula 2 - Mechanical (mechanic) power equation: P = E / t where power P is in watts, energy E is in joules, and time t is in seconds. 1 W = 1 J/s. Undistorted powerful sound is barely to find in these formulas. Watch your ears! Electric (electrical) energy is E = P × t - measured in watthours, or also in kWh.
Tip: The electrical power triangle (power formula)
The magic triangle can be used to calculate all formulas of the "electric power law". You hide witha finger the value to be calculated. The other two values show then how to do the calculation.
Calculations: Ohm's law - Ohm's magic triangle
•
ALTERNATING CURRENT (AC) ~
Vl = line voltage (volts), Vp = phase voltage (volts), Il = line current (amps), Ip = phase current (amps)Z = impedance (ohms), P = power (watts), φ = power factor (angle), VAR = volt-amperes (reactive)
Current (single phase): I = P / Vp×cos φ Current (3 phase): I = P / √3 Vl×cos φ or I = P / 3 Vp×cos φPower (single phase): P = Vp×Ip×cos φ Power (3 phase): P = √3 Vl×Il×cos φ or P = √3 Vp×Ip×cos φPhase factor PF = cos φ and φ = power factor (angle)
Conversions of more different units:
prefixes length area volume weight pressure temperature time energy power density velocity acceleration force
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next
home
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Tuesday, October 2, 2007
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