Description
You can recite V = IR in your sleep and still not feel what happens to the current when the voltage moves. PhET's Ohm's Law blows the formula up into three huge letters, and as you drag the voltage or resistance slider, the letters resize and the current reading follows, so the relationship is obvious at a glance.
A resistor tube full of dots sits in the circuit: more resistance crowds the electrons and the current drops, which turns a dry proportion into something you can watch.
Sliders for voltage and resistance: Drag to change the battery stack and the resistance; the milliamp reading updates instantly.
Letters that scale with values: V, I and R in the equation grow and shrink with their numbers, so no mental arithmetic is needed.
Visible electron density: The dots in the resistor stand for electrons, so resistance is drawn right in front of you.
Single-file offline use: One HTML file that opens in any browser, no connection needed.
A resistor tube full of dots sits in the circuit: more resistance crowds the electrons and the current drops, which turns a dry proportion into something you can watch.
Features
Sliders for voltage and resistance: Drag to change the battery stack and the resistance; the milliamp reading updates instantly.
Letters that scale with values: V, I and R in the equation grow and shrink with their numbers, so no mental arithmetic is needed.
Visible electron density: The dots in the resistor stand for electrons, so resistance is drawn right in front of you.
Single-file offline use: One HTML file that opens in any browser, no connection needed.
