Ohm's law – voltage, current and resistance

Integrated ScienceElectricity & MagnetismAges 14–15

A simple circuit with a row of cells in series, a resistor and an ammeter. Drag the sliders to change the voltage U and the resistance R, and watch the current I = U/R change through the letter sizes in the equation, the number of cells, the density of impurity dots in the resistor, and the arrows and charges flowing round the circuit. Record your measurements in a table and view the I–U graph to work out which quantities are directly or inversely proportional. Based on the "Ohm's Law" simulation by PhET Interactive Simulations, University of Colorado Boulder (CC BY 4.0); rewritten.

Lesson: Resistance and Ohm's law