9V Battery with 100Ω Resistor
A 9 V battery connected to a 100 Ω resistor produces a current of 90 mA (0.09 A).
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.
A 9 V battery and 100 Ω resistor is a classic beginner electronics circuit — find the current using Ohm's Law.
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.