Ohm's Law

📖 What is Ohm's Law?

Ohm's Law states that the voltage across a conductor is directly proportional to the current flowing through it, with the constant of proportionality being the resistance. It is the foundation of electrical circuit analysis.

V = I × R

🔤 What Each Variable Means

V

Voltage (Volts, V)The electrical potential difference — the "push" driving current through the circuit

I

Current (Amperes, A)The flow of electric charge through the conductor

R

Resistance (Ohms, Ω)How much the conductor opposes the flow of current

📝 Step-by-Step Example

A circuit has a current of 2 A flowing through a resistor of 15 Ω. What is the voltage?

1

Identify known valuesI = 2 A R = 15 Ω

2

Write the formulaV = I × R

3

Substitute valuesV = 2 × 15

✓

Answer: V = 30 V

The voltage across the resistor is 30 Volts.

🧮 Interactive Calculator

Current I (Amperes)

Resistance R (Ohms)

Result will appear here

🔄 Rearranged Versions

Find Current:

I = V / R

Find Resistance:

R = V / I

📖 What is Ohm's Law?

🔤 What Each Variable Means

📝 Step-by-Step Example

🧮 Interactive Calculator

🔄 Rearranged Versions

🔗 Related

🎯 Quick Fact