Enter 2 values to get the other values and press the Calculate button:
A voltage calculator is a handy tool that helps you determine important electrical properties. By inputting voltage parameters, you can predict the current, resistance, or power in a circuit.
Why Voltage Matters
✔️ Powering electrical devices
✔️ Preventing component damage
✔️ Mitigating shock/fire risks
✔️ Conserving energy
✔️ Transmitting signals effectively
What is Voltage?
Voltage represents electromotive force or “electrical pressure” applied to push current through resistive materials. Measured in volts (V), higher voltage enables more electrons to flow against friction like water pressure forcing flow through narrow pipes. Lower voltage currents struggle against resistance.
Using the Voltage Calculator
Relating voltage to other electric properties involves:
 Inputting any two known values
 Selecting appropriate units
 Computing remaining metrics
For example, a 3ohm resistor with 0.5 amp current reflects a 1.5volt potential difference. Simple!
Sample Calculations
Resistance 
Current 
Voltage 
Power 
10 Ω 
2 A 
20 V 
40 W 
5 Ω 
0.25 A 
1.25 V 
0.31 W 
Useful relating loads, wiring ratings, and batteries.
Digital Multimeter Usage
Handy electrical multimeters instantly measure values for input into the calculator. They detect:
 Voltage  Volt scale
 Current  Amp scale via probes
 Resistance  Ohm scale
This enables realworld troubleshooting by crosschecking circuit parameters against ratings.
6 Ways Electrical Voltage is Measured

Multimeter
 A digital or analog multimeter directly measures the voltage between two probed points in a circuit. Select the appropriate voltage scale (V, mV, kV) based on the expected readings.

Clamp Meter
 Clampstyle ammeters conveniently measure the current flowing through a wire, which can then be used with known resistance to calculate voltage using Ohm's Law (V = I x R).

Voltmeter
 Either standalone units or integrated on other test equipment. Voltmeters connect across components to take readings without needing to break circuits.

Oscilloscope
 Plots a graph of voltage over time onscreen. Allow visualizing and quantifying AC voltages or transient spikes.

Data Loggers
 Capture networked, timebased voltage readings for remote monitoring of critical systems. Store measurement trends.

Load Cells
 Specialized voltage sensors convert parameters like pressure, force or strain into proportional electrical signals for instrumentation systems.
Ohm's Law Applications
The electrical correlations powering the calculator originate from Ohm's famous discovery stating:
Voltage (V) = Current (I) x Resistance (R)
This core relationship mathematically interlinks the primary circuit properties as explored further here.
Calculations Using Ohm's Law
Permuting the Equation enables solving for any single unknown:
 V = I x R ==> Voltage
 I = V / R ==> Current
 R = V / I ==> Resistance
Substitute reference chart:
Electrical Property 
Symbol 
Unit 
Voltage 
V 
volts (V) 
Current 
I 
amps (A) 
Resistance 
R 
ohms (Ω) 
So once securing any two metrics, the third extrapolates through rearrangement.
Scenarios Applying Ohm's Law
Everyday use cases include:
 Sizing wires and fuses
 Selecting appropriate batteries
 Troubleshooting shorted windings
 Computing parallel resistances
 Designing timing circuits
This indispensable relation touches practically all electrical engineering disciplines and daily needs for safe power transfer.
Limitations
Note Ohm's strict assumptions:
❌ Time invariant voltages/currents
❌ Homogenous conductive materials
❌ Temperature stable
Realworld nonlinear effects require advanced modeling.
Frequently Asked Questions (FAQs)
Q1: What is voltage?
Voltage is the force or potential difference between two points in an electrical circuit, measured in volts (V). It determines the intensity of the electric current flowing through the circuit.
Q2: How is voltage measured?
Voltage is measured using a device called a voltmeter. The voltmeter is connected to the two points between which the voltage is to be measured, and it displays the voltage reading in volts.
Q3: What is the significance of voltage in electrical circuits?
Voltage is essential in electrical circuits as it determines the flow of electric current.
Conclusion
In summary, an adjustable voltage calculator empowers both electricians and aspiring inventors alike by effortlessly relating key variables for verification, safety, and optimal electrical system function.
Read More: Voltage and Current  Basic Concepts Of Electricity