A FREE Ohm’s Law Calculator is an online electrical calculator that helps you quickly determine voltage, current, resistance, or power in an electrical circuit using Ohm’s Law.
I=VRI = \frac{V}{R}
I=12.0 V6.0 Ω=2.00 AI=\frac{\text{12.0}\,\mathrm{V}}{\text{6.0}\,\Omega}=\text{2.00}\,\mathrm{A}I=6.0Ω12.0V=2.00A
VsV_sVs
V
VsV_sVs
RRR
Ω
RRRVs = 12.0 V+-R = 6.0 ΩI = 2.00 A
Give feedback
What is Ohm’s Law?
Ohm’s Law describes the relationship between voltage (V), current (I), and resistance (R):
V = I × R
From this relationship, you can calculate:
- Voltage: V = I × R
- Current: I = V ÷ R
- Resistance: R = V ÷ I
Example
If a circuit has:
- Voltage = 12 volts
- Resistance = 6 ohms
The current is:
I = 12 ÷ 6 = 2 amps
So the circuit carries 2 amperes of current.
What can an Ohm’s Law Calculator calculate?
A useful free calculator can calculate:
- ⚡ Voltage (V)
- 🔌 Current (A)
- 🧱 Resistance (Ω)
- 🔥 Power (W)
Power can also be calculated using formulas such as:
- P = V × I
- P = I² × R
- P = V² ÷ R
Who can use it?
The tool is useful for:
- Electrical engineering students
- Electronics students
- Electricians
- Arduino and Raspberry Pi projects
- DIY electronics
- Circuit designers
- Hobbyists
- Technicians
- Physics students
- Electrical troubleshooting
In simple terms: a FREE Ohm’s Law Calculator lets you enter the electrical values you already know and instantly find the missing voltage, current, resistance, or power.
