How to calculate input current?

Voltage current power calculation formula

P=U*I can calculate the Power of three phases by multiplying 220 (phase voltage) by the current of each phase and multiplying by three.

You can also use 380 (line voltage) multiplied by the current per phase and then multiplied by the root number 3.

Because the line voltage is three times the root of the phase voltage, the two formulas are equal!

380 and 220 voltage current power calculation formula is the same?

If both are single-way formula is the same. If 220V is one way. And 380 three-way is not the same formula.

The current formula is Power divided by voltage?

I’ll give you an answer, your 380V is three-phase, 380V refers to the line voltage between phase and phase, and the current is single-phase voltage, so, to convert 380V into single-phase voltage, and 9000 is the total Power of three steps, so the single-phase current should be (9000/3)/(380/root 3) = 3000/380/1.732.

Calculate all the formulas for current, voltage, resistance, and Power?

Calculate all formulas for current, voltage, resistance, and Power

1, series circuit current and voltage have the following laws: (for example R1, R2 series) 

① current: I = I1 = I2 (the current at each point in the series circuit is equal) 

② voltage: U = U1 + U2 (total voltage is similar to the sum of the voltage at each location)

There is voltage; there is current amperage, the formula for calculating Power.

Electric Power is equal to the product of voltage and current [(P = U – I)

For purely resistive circuits, calculating electrical Power can also be used to calculate the formula P = I^2 R and P = U^2 /R

For example, if an electrical appliance has a rated input current of 28A and a supply voltage of 380V, what is the Power in KW/hour? 

Answer: 380×28.

Motor current, the power calculation formula

Motor current, power calculation formula Motor current, the power calculation formula 

Single-phase: I = P / (U * cosfi) single-phase voltage U = 0.22KV, cosfi = 0.8 then: I = P / (0.22 * 0.8) = 5.68P 

Note: I is single-phase motor current, P is single-phase motor power transformer high and low voltage side current.

Power 165 kilowatts, voltage 380 volts, what is the current? Calculation formula. 

With AC, Power is considered right.

I=P/380*root number 3=P/220=750A… Root number 3 = 1.732

Here the voltage U=380V is the pole value, and the relationship between the RMS value and the pole value is that of the root number 3, i.e., pole value = root number 3 * RMS value.

The formula for calculating current and voltage?


What exactly does the current and voltage inside the formula for calculating the Power of a three-phase motor refer to? 

= phase current; line voltage = root 3 phase voltage. The tail wire connects the three windings; the potential is zero, so the voltage of the windings is 220 volts. When the motor is connected at an angle: line current = root 3 phase current; line voltage = phase voltage. 

The winding is directly connected to 380, the current of the wire is the vector sum of the two winding currents. 

Power calculation formula p = root three UI multiplied by

Voltage and current calculation formula

R1=5V/0.1A=50Ω R2=2V/0.05A=40Ω R=R1+R2=90Ω 

∵ series connection I1>I2 

∴ the maximum current is 0.05V 


∵ parallel connection U1>U2 

∴The maximum voltage is 2V 


Known a motor power 2.2KW voltage 380V current 5A

Input three-phase power = voltage X current X root number 3(1,73) 

Current = power / (voltage X root number 3) = 26000W / (380 X 1,73) = 39.5A (rated current) 

Start current should be greater than 2 to 3 times the rated current, to use a 100A meter Meter to match.

For power voltage and current formula Power voltage and current formula?

= I1 + I2 + … In 4, series circuit, the total current and each current equal I = I1 = I2 = I3 = … = In 5, the power of the load 

Pure resistive active power P=UI → P=I2R (equation two is squared) 

U: voltage, V; I: current, A; P: active Power, W; R: resistance pure inductive reactive power.

Calculation of Power, voltage, current

Friend, the relationship between power P, voltage U, current I is: P = IU

The water heater is generally a pure resistance load, so it should say that its currency should be I = P / U = 6000/220 = 27.27A. Still, according to your “6000W fast water heater, the marked current is 14A” situation; this water heater should be central.

How to calculate the voltage and current Power?

DC or single-phase 220V pure resistive load (all electrical energy into heat): power P = current I * voltage U * efficiency n single-phase 220V electric equipment (such as motors): P = I * U * power factor cos-p * n three-phase 380V electric heating equipment: P = 1.732 * I * U * n three-phase 380V electric equipment: P = 1.732…

Copper core wire diameter and can withstand the current. Voltage. The formula for calculating Power 

Power (W) = current (A) × rated voltage (220V)

The wire diameter of the copper core wire and can withstand the current. Voltage. Calculation formula of Power 

Power (W) = current (A) × rated voltage (220V) 

For voltage, current, Power, resistance value conversion? 

Φ Calculation formula for three-phase resistive power = 1.732*line voltage U*line current I (star connection) = 3*phase voltage U*phase current I (angle connection) Calculation formula for three-phase motor power = 1.732*line voltage U*line current I*power factor COSΦ (star current=I, voltage=U, resistance=R, power=P.)

Current * Voltage = Power Is this formula correct?

The formula is correct, but you need to know 4.2A equal to how much wattage there is voltage ah if the title tells you it is a home circuit, then you bring 220v Q: 220V voltage 4.2 current is how much Power? Answer: You get into the calculation ah, 924w.

The formula for calculating resistance, voltage, and current

Voltage:U Current:I Resistance:R Power:P U=IR; I=U/R; R=U/I; P=UI; P=I^2R; P=U^2/R; U=P/I=Root(PR); I=P/U=Root(P/P); R=P/I^2=U^2/P; (^ square) .

The formula for a parallel capacitor? Capacity, voltage, current? 

The total capacitance (equivalent capacitance) of a capacitor in parallel is c=u/q=q1+q2+q3/u=(c1+c2+c3)u/u=c1+c2+c3 This is a 3-capacitor parallel example c denotes capacitance q denotes total power u denotes voltage.


Ena Leung

Ena Leung

Leave a Reply

Your email address will not be published. Required fields are marked *

ten + 20 =

On Key

Related Posts

The Newest & Hottest Products In 2022

All your answers are in SANPU’s monthly report, 2022

We picked up the most popular items from 1,000+ items of our clients, to help you find the wining product.

Ask For A Quick Quote

We will contact you within 1 working day, please pay attention to the email with the suffix “”.