How do I calculate volts, amps, and watts?

Use Ohm’s Law formulas: Watts = Volts × Amps, Volts = Watts ÷ Amps, and Amps = Watts ÷ Volts. Our online electrical calculator automatically performs these calculations when you input any two values to find the third.

What is a voltage divider calculator and how does it work?

A voltage divider calculator determines output voltage when two resistors divide input voltage proportionally. Enter input voltage and both resistor values to calculate the exact output voltage across the second resistor using the formula Vout = Vin × (R2/(R1+R2)).

How do I calculate current in a voltage divider circuit?

Calculate voltage divider current using Ohm’s Law: Current = Input Voltage ÷ Total Resistance (R1 + R2). The same current flows through both resistors in series, making this calculation essential for power consumption analysis.

Where can I find a reliable electrical calculator online?

Professional electrical calculators are available online for free, offering instant calculations for voltage, current, resistance, and power. Look for calculators that include multiple formulas, unit conversions, and clear step-by-step solutions for accurate electrical engineering results.

Why should I use an electrical calculator instead of manual calculations?

Electrical calculators eliminate human error, provide instant results, and handle complex formulas automatically. They ensure accuracy in critical electrical work, save time on repetitive calculations, and often include helpful features like unit conversions and formula explanations for better understanding.

Free Voltage divider,amps,watts,kW,joules,eV calculator

Electrical Calculator Tool

Voltage Divider Calculator

Enter 3 values to get the 4th value

Input voltage (V_in):

Resistance (R₁):

Resistance (R₂):

Output voltage (V_out):

Voltage Divider Rule

For R₁ and R₂ in series and V_out is the voltage of R₂:

V_out = (R₂ / (R₁ + R₂)) × V_in

📋 Example

If V_in = 12V, R₁ = 1000Ω, and R₂ = 2000Ω:
V_out = (2000 / (1000 + 2000)) × 12 = (2000 / 3000) × 12 = 8V

Volts to Amps Calculator

Calculate current using voltage and power or resistance

Calculation type:

Enter volts: V

Enter watts: W

Volts to Amps Calculation

I_(A) = P_(W) / V_(V)

The current I in amps (A) is equal to the power P in watts (W), divided by the voltage V in volts (V).

I_(A) = V_(V) / R_(Ω)

The current I in amps (A) is equal to the voltage V in volts (V) divided by the resistance R in ohms (Ω).

📋 Example

For V = 230V and P = 1000W:
I = P / V = 1000W / 230V = 4.35A

Volts to Watts Calculator

Calculate power using voltage and current

Select current type:

Enter voltage: V

Enter current: A

Volts to Watts Calculation Formulas

DC:

P_(W) = V_(V) × I_(A)

AC Single Phase:

P_(W) = PF × I_(A) × V_(V)

AC Three Phase:

P_(W) = √3 × PF × I_(A) × V_L-L(V)

📋 Example

For DC circuit with V = 12V and I = 2A:
P = V × I = 12V × 2A = 24W

Volts to Kilowatts Calculator

Calculate power in kilowatts using voltage and current

Select current type:

Enter voltage: V

Enter current: A

Volts to Kilowatts Calculation Formulas

DC:

P_(kW) = V_(V) × I_(A) / 1000

AC Single Phase:

P_(kW) = PF × I_(A) × V_(V) / 1000

AC Three Phase:

P_(kW) = √3 × PF × I_(A) × V_L-L(V) / 1000

📋 Example

For AC single phase with V = 230V, I = 10A, and PF = 0.9:
P = 0.9 × 10A × 230V / 1000 = 2.07 kW

Volts to Joules Calculator

Calculate energy using voltage and charge

Enter voltage: V

Enter charge: C

Volts to Joules Calculation

E_(J) = V_(V) × Q_(C)

The energy E in joules (J) is equal to the voltage V in volts (V), times the electrical charge Q in coulombs (C).

📋 Example

For V = 5V and Q = 2C:
E = V × Q = 5V × 2C = 10J

Volts to Electron-volts Calculator

Convert voltage to energy in electron-volts

Enter voltage: V

Select charge type:

Enter charge: e

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⚡ Electrical Calculator Tool

Voltage Divider Calculator

Volts to Amps Calculator

Volts to Watts Calculator

Volts to Kilowatts Calculator

Volts to Joules Calculator

Volts to Electron-volts Calculator

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