Grade 11 Physics · SPH3U · nothing is recorded
Wire it. Predict it. Let the meters testify.
Every bulb is an identical 6 Ω filament. Pick a battery, a bulb count, and a wiring — then predict the battery current before you look at the meters. The glow, the meters, and the ledger all come from one model, so they can never disagree.
bulbs
wiring
Predict, then peek
Before reading the meters below: how much current does the battery supply? (V = IR — total the resistance first.)
The meters
- total resistance
- 12 Ω
- battery current
- 1 A
- each bulb
- 6 V · 1 A · 6 W
- total power
- 12 W
The ledger closes
2 × 6 V = 12 V spent — exactly the battery's 12 V ✓
Kirchhoff's voltage law: around any loop, the drops spend exactly what the source supplies.