Kirchhoff & Dividers

Two laws for any circuit

An interactive lesson with 7 steps, about 6 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Junction rule: current in = current out. Loop rule: rises = drops.
• Voltage divider: $V_{\text{out}} = V_{\text{in}} R_2 / (R_1 + R_2)$.
• A sensor in a divider turns light or temperature into a voltage; loads change the output.

Steps

1. Kirchhoff’s laws
2. At a junction
3. Around a loop
4. The voltage divider
5. Make 3.3 volts
6. A night light
7. Loading the divider