Ohm's Law: 3V and 0.3A — Find Resistance
A 3 V source with 0.3 A current corresponds to a resistance of 10 ohms per Ohm's Law.
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 determine the resistance in a 3 V, 0.3 A circuit — common in small electronics.
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.