🔌 Circuit Lab — Ohm's Law
Push the voltage up and the bulb glows brighter; add resistance and it dims. That's Ohm's Law: V = I × R. Slide the battery and the resistor and watch the current and the light respond. More voltage = more current. More resistance = less current.
Current I = V ÷ R (amps). Power P = V × I (watts) — that's how bright the bulb burns.