Current and Power: 9 V Battery, 100 Ω Resistor
A 9 V battery connected to a 100 Ω resistor drives 90 mA of current and dissipates 810 mW.
How to use this tool
- Enter known values, voltage v, current i, resistance r and power p in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your power p and the full breakdown beneath it.
This is a classic beginner circuit: a 9 V battery and a 100 Ω resistor produce 90 mA of current and dissipate just under 1 W as heat.
Frequently asked questions
- How is this different from the Ohm's Law calculator?
- The Ohm's Law calculator solves V=IR for three variables. This tool adds the power equations (P=VI, P=I²R, P=V²/R) and lets you start from any two of the four quantities P, V, I, R.
- What are real-world examples?
- A 60 W light bulb on 120 V draws I = P/V = 0.5 A, with R = V/I = 240 Ω.