Ohm's Law: 5V at 0.5A — Find Resistance
A 5 V source driving 0.5 A of current requires a resistance of exactly 10 ohms.
How to use this tool
- Enter voltage (v), current (i) and resistance (r) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your voltage and the full breakdown beneath it.
Use Ohm's Law to find the resistance in a simple 5 V, 0.5 A circuit.
Frequently asked questions
- What units are used?
- Volts (V) for voltage, Amperes (A) for current, Ohms (Ω) for resistance, and Watts (W) for power. Keep units consistent.
- Does Ohm's Law apply to AC circuits?
- For pure resistors, yes. For capacitors and inductors you need impedance Z (complex resistance), and V = IZ replaces V = IR.