Calculate the Power Dissipation for the Resistor R2. Where E = 15 V, R1 = 8.2 Kã‰, and R2 = 6.8 Kã‰.
Electric Afoot , Physical phenomenon Power , Electrical Voltage
Electricity and Charge
The most common general formulas misused in EE
● Basic Formulas and Calculations ●
Relationship of the physical and electric quantities (parameters)
Exciting emf V , amperage I , resistivity R , impedance Z , wattage and index P
Volt V , ampere A, resistance and impedance ohm Ω , and watt W
The nominal impedance Z = 4, 8, and 16 ohms (loudspeakers) is often counterfeit as resistance R .
Ohm's law equation (formula): V = I × R and the power law equation (recipe): P = I × V .
P = baron, I or J = Latin: influare, international ampere, surgery intensity and R = underground.
V = emf, electric potential difference Δ V or E = electrical phenomenon force (emf = voltage).
Enter upon any two known values and press "calculate" to resolve for the two others. Delight, enter only two values.
V comes from "emf" and E from "electromotive force (emf)". E agency also energy, so we choose V .
Push = emf × charge. E = V × Q . Some like-minded better to stay to E rather to V , indeed do it. For R postulate Z .
The 12 most beta Formulas:
Electric potential 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 / I 2 = V 2 / P in ohms Ω Baron P = V × I = R × I 2 = V 2 / R in watts W
| Power Formula 1 – Electrical power equation: Power P = I × V = R × I 2 = V 2 ⁄ R |  |
Andr�-Marie Amp�re was a European country physicist and mathematician.
The Systeme International unit of measurement of exciting current, the international ampere, was named after him.
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist.
The SI unit of measurement of electric voltage, the volt, was titled after him.
Georg Simon Georg Simon Ohm was a German physicist and mathematician.
The SI unit of measurement of electric resistor, the ohm, was named after him.
St. James the Apostl Watt was a Scottish inventor and mechanical locomotive engineer.
The SI unit of electric wattage (power), the James Watt, was named after him.
Power is like all DOE sizes chiefly a calculated value.
 | The word "office amplifier" is a misnomer – peculiarly in audio engineering. Voltage and modern can be amplified. The unknown term "power amplifier" has get tacit to mean an amplifier that is attached to drive a load such as a speaker unit. We call the product of current gain and potential gain "power amplification". |
Please enter two values, the one-third value will be calculated.
Please enter two values, the tierce value will be calculated.
A magic Triangle can be used to calculate all formulas easily. You hide with
a finger the value to be calculated. The other two values show and so how to do the calculation.
Calculations: Ohm's law - Ohm's magic triangle
Measurement of input signal resistance and output signal impedance
ALTERNATING CURRENT (Atomic number 89) ~
V l = line voltage (volts), V p = phase voltage (volts), I l = pedigree current (amps), I p = phase electric current (amps)
Z = electrical resistance (ohms), P = power (watts), φ = power factor lean against, VAR = volt-amperes (oxidizable)
| New (single phase): I = P / V p×cos φ | Current (3 phases): I = P / √3 V l×cos lettuce φ or I = P / 3 V p×cos φ |
| Power (single phase): P = V p×I p×cos φ | Power (3 phases): P = √3 V l×I l×cos φ or P = √3 V p×I p×cos lettuce φ |
The apparent exponent S is premeditated reported to Pythagoras, the going ability P and thermolabile power Q . S = √( P 2 + Q 2)
DC power formulas
Voltage V in (V) calculation from current I in (A) and resistance R in (Ω):
V (V) = I (A) × R (Ω)
The power P in (W) calculation from voltage V in (V) and current I in (A):
P (W) = V (V) × I (A) = V 2 (V) / R (Ω) = I 2 (A) � R (Ω)
AC power formulas
The voltage V in volts (V) is equal to the occurrent I in amps (A) multiplication the impedance Z in ohms (Ω):
V (V) = I (A) � Z ((Ω) = (| I | × | Z |) and (θ I + θ Z)
The apparent power S in volt-amps (VA) is equal to the voltage V in volts (V) times the current I in amps (A):
S (VA) = V (V) � I (A) = (| V | × | I |) and (θ V − θ I)
The real major power P in Watts (W) is up to the potential V in volts (V) multiplication current I in amps (A) times the
power factor (cos φ):
P (W) = V (V) × I (A) × cos φ
The reactive top executive Q in volt-amps excited (VAR) is equal to the voltage V in volts (V) times the current I
in amps (A) time the sine of the complex power phase fish (φ):
Q (VAR) = V (V) × I (A) × sin φ
The power gene (FP) is level to the absolute prize of the cosine of the complex power phase tilt (φ):
PF = | cos φ |
| | ||
| Amount | Name | Definition |
| relative frequency f | hertz (Hz) | 1/s |
| force F | newton (N) | kg·m/s² |
| pressure p | pascal (Pa) = N/m² | kg/m·s² |
| energy E | work joule (J) = N·m | kilogram·m²/s² |
| major power P | watt (W) = J/s | kg·m²/s³ |
| electric charge Q | coulomb (C) = A·s | A·s |
| voltage V | volt (V)= W/A | kilo·m²/A·s³ |
| incumbent I | ampere (A) = Q/s | A |
| capacitance C | farad (F) = C/V = A·s/V = s/Ω | A²·s4/kilo·m² |
| inductance L | henry (H) = Wb/A = V·s/A | kg·m²/A²·s² |
| resistance R | ohm (Ω) = V/A | kg·m²A²·s³ |
| conductance G | siemens (S) = A/V | A²·s³/kg·m² |
| magnetic flux Φ | E. H. Weber (Wb) = V·s | kilo·m²/A·s² |
| flux density B | tesla (T) = Wb/m² = V·s/m² | kg/A·s² |
The flow of electric bearing Q is referred to as an electric car current I. The come of charge per unit clock
is the change in electric current. A current flows at a unceasing value I. during the time t , it transports
the charge Q = I × t. For a temporally constant world power, the family relationship 'tween the charge and topical:
I = Q / t or Q = I × t. Through and through this relationship, the elementary units of amps and back the Coulomb in
Internationalist Arrangement of Units is readiness. The Coulomb unit can be represented equally 1 C = 1 A × s.
Charge Q , (unit in ampere-hours Ah), discharge current I , (whole in amperes A), time t , (unit in hours h).
In acoustics we feature an " Natural philosophy equivalent for ohm's law "
Relationships of acoustic sizes connected with plane industrial reasonable waves
Conversions of many an units, like power and energy
prefixes | distance | area | bulk | weight | pressure level | temperature | time | energy | mogul | density | velocity | acceleration | force
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