Ohm's Law Concept

Demonstrations in Ohm's Law

Safety

Ohm's Law

A light bulb, ammeter, and voltmeter are connected in a circuit controlled by a Variac. Gradually increasing the voltage and comparing and at each step reveals the relationship -- and …
Optima car battery with red top connected by yellow cables to a wooden board holding a knife switch with thin iron wire mounted across the terminals
Safety

Resistance and Current

Shows that electrical hazard depends on current, not voltage alone. Touching a 12V car battery with your hand is safe (~1 MΩ body resistance, ~12 μA), but shorting the same …