Fig 5Series and paralleltwo 6 Ω bulbsbattery supplies 1 A
wiring
In series, the current has one path through both bulbs, so each bulb gets only half the battery's voltage and both glow dimly, and removing either one breaks the circuit for both. In parallel, each bulb sits directly across the battery, so each gets the full 12 V and four times the power, and each runs on its own, which is why the outlets in a house are wired in parallel. The battery then supplies the sum of both currents.