Joules to Volts Calculator

Convert energy and charge to voltage using physics principles

Energy to Voltage Converter

Energy

Amount of energy in the system

Electric Charge

Amount of electric charge

Voltage Result

Primary Result

100 V

Volts

Alternative Units

100000 mV

0.1 kV

1.000e+8 μV

Voltage Category:

Medium Voltage

Potentially hazardous

Formula Used:

V = E / Q

Where: V = Voltage (V), E = Energy (J), Q = Charge (C)

Calculation Steps:

1. Energy: 1000 J = 1000 J
2. Charge: 10 C = 10 C
3. Voltage = 1000 J ÷ 10 C
4. Result: 100 V

Common Examples

Car Battery (12V)

Energy: 1,440 kJ (400 Wh)

Charge: 120,000 C (33.3 Ah)

Voltage: 12 V

Household Outlet

Energy: 1 kWh = 3.6 MJ

Charge: 32,727 C (9.09 Ah)

Voltage: 110 V

Smartphone Battery

Energy: 54 kJ (15 Wh)

Charge: 14,400 C (4 Ah)

Voltage: 3.7 V

AA Battery

Energy: 7.2 kJ (2 Wh)

Charge: 4,800 C (1.33 Ah)

Voltage: 1.5 V

Quick Reference

Energy Units

1 kJ = 1,000 J

1 kWh = 3,600,000 J

1 cal = 4.184 J

1 eV = 1.602 × 10⁻¹⁹ J

Charge Units

1 C = 1,000 mC

1 Ah = 3,600 C

1 e = 1.602 × 10⁻¹⁹ C

Voltage Levels

<1 V: Electronics

12V: Automotive

110-240V: Household

>1000V: High voltage

Physics Concepts

Energy (E):

The capacity to do work, measured in joules (J)

Charge (Q):

Amount of electric charge, measured in coulombs (C)

Voltage (V):

Electric potential difference, measured in volts (V)

Key Formula:

V = E / Q

Voltage equals energy divided by charge

⚠️ Safety Notes

High Voltage (>50V):

Can be dangerous or lethal. Requires proper training and safety equipment.

Medium Voltage (12-50V):

Generally safe for dry conditions but use caution around water.

Low Voltage (<12V):

Typically safe for direct contact in normal conditions.

Understanding Energy, Charge, and Voltage

What is Energy?

Energy is the fundamental capacity to do work or cause change. In electrical systems, energy represents the total amount of work that can be performed by moving electric charges. It's measured in joules (J), where one joule equals the work done when one ampere flows through one ohm for one second.

What is Electric Charge?

Electric charge is a fundamental property of matter that causes it to experience forces in electromagnetic fields. Measured in coulombs (C), one coulomb represents the amount of charge carried by approximately 6.24 × 10¹⁸ electrons. Charge can be positive (protons) or negative (electrons).

Conservation Laws

•Energy Conservation: Energy cannot be created or destroyed, only converted
•Charge Conservation: Total electric charge in a closed system remains constant

What is Voltage?

Voltage, also called electric potential difference, is the "pressure" that pushes electric charges through a conductor. It represents the energy per unit charge, calculated as V = E/Q. Voltage is what causes current to flow in electrical circuits, much like water pressure causes water to flow through pipes.

The V = E/Q Relationship

This fundamental formula shows that voltage is directly proportional to energy and inversely proportional to charge. More energy or less charge results in higher voltage, while less energy or more charge results in lower voltage.

Real-World Applications

• Battery design and capacity calculations
• Power supply specifications
• Electric vehicle charging systems
• Solar panel output calculations
• Capacitor energy storage analysis

Important Notes

• This calculator assumes ideal conditions without energy losses
• Real-world systems may have inefficiencies that affect actual voltage
• Always consider safety precautions when working with electrical systems
• Negative values indicate opposite polarity or direction