Electrical Calculator

An electrical calculator is a device designed to perform various electrical calculations, required for electrical engineers, electricians, students and DIY enthusiasts. This simplifies complex electrical formulas and helps design, troubleshoot and analyze electric cycle.

Common Electrical Calculations:

• Ohm’s Law Calculator – calculates voltage, current, resistance and power.
• Power Calculator – determines power (W) from voltage and power.
• Resistor Color Code Calculator – Identifies resistor values from color bands.
• Voltage Drop Calculator – Computes voltage drop across wires.
• Parallel & Series Resistor Calculator – Calculates total resistance in series/parallel circuits.
• Capacitor Charge Calculator – Finds charge time for capacitors in circuits.
• AC to DC Conversion Calculator – Converts alternating current to direct current.

Key Electrical Formulas:

1. Ohm’s Law (Relationship between Voltage, Current, and Resistance):

V=I×R

where:

• V = Voltage (Volts)
• I = Current (Amps)
• R = Resistance (Ohms)

2. Power Formula:

P=V×I

where:

• P = Power (Watts)
• V = Voltage (Volts)
• I = Current (Amps)

3. Resistance in Series:

Rtotal​=R1​+R2​+R3​+...

4. Resistance in Parallel:

Rtotal/​1​=R1/​1​+R2/​1​+R3/​1​+...

5. Voltage Drop Formula:

Vdrop​=I×R

6. Capacitor Charge Formula:

V(t)=Vmax​×(1−e−RC/t​)

Key Uses of the Electrical Calculator:

• Circuit Design & Analysis – Helps engineers design efficient circuits.
• Troubleshooting Electrical Systems – Quickly finds voltage, current, and resistance values.
• Power Consumption Estimation – Calculates power usage for electrical devices.
• Resistor & Capacitor Selection – Determines appropriate resistor and capacitor values.

Electrical Safety & Wiring – Ensures proper voltage drop calculations in wiring.

1. Choose the Calculation Type

• Example: Ohm’s Law Calculation

2. Enter Known Values

• Example: Voltage (V) = 12V, Resistance (R) = 6Ω

3. Click ‘Calculate’

• The tool provides the missing electrical parameter instantly.

Example 1: Ohm’s Law – Find Current

Input:

• Voltage (V): 24V
• Resistance (R): 8Ω

Calculation:

I=R/V​=8/24​=3A

Result:

• Current (I) = 3A

Example 2: Power Calculation

Input:

• Voltage (V): 230V
• Current (I): 10A

Calculation:

P=V×I=230×10=2300W

Result:

• Power (P) = 2300W

Here is a Reference Table for Electrical Calculations:

Common Electrical Conversions & Formulas

Calculation

Formula

Example

Ohm’s Law (Voltage)

V = I × R

10A × 5Ω = 50V

Ohm’s Law (Current)

I = V ÷ R

50V ÷ 5Ω = 10A

Ohm’s Law (Resistance)

R = V ÷ I

50V ÷ 10A = 5Ω

Power (Watts)

P = V × I

230V × 2A = 460W

Power (Using Resistance)

P = V² ÷ R

(230V)² ÷ 100Ω = 529W

Power (Using Current)

P = I² × R

(5A)² × 10Ω = 250W

Energy (Joules)

E = P × t

100W × 2h = 200Wh

Capacitor Charge

Q = C × V

10μF × 12V = 120μC

Inductive Reactance

X_L = 2πfL

2 × 3.14 × 50Hz × 0.1H = 31.4Ω

Capacitive Reactance

X_C = 1 ÷ (2πfC)

1 ÷ (2 × 3.14 × 50Hz × 100μF) = 31.8Ω

Electrical Conversion Reference Table

From Unit

To Unit

Conversion Factor

1 Watt (W)

Kilowatt (kW)

0.001 kW

1 Kilowatt (kW)

Watt (W)

1000 W

1 Ampere (A)

Milliampere (mA)

1000 mA

1 Ohm (Ω)

Kilo-ohm (kΩ)

0.001 kΩ

1 Volt (V)

Millivolt (mV)

1000 mV

1 Coulomb (C)

Microcoulomb (μC)

1,000,000 μC

1 Farad (F)

Microfarad (μF)

1,000,000 μF

1 Henry (H)

Millihenry (mH)

1000 mH