Three transformer rows keep ideal voltage-current power balanced and then close the energy ledger over time.
Ideal transformer rows close both power and energy ledgers. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Two-to-four turns doubles voltage
Turns 2 to 4 double voltage from 4 V to 8 V. Primary power 16 W over 3 s gives energy 48 J.
4×4=16,E=16×3=48
Three-to-six turns keeps power balanced
Turns 3 to 6 double voltage from 6 V to 12 V. Primary power 12 W over 5 s gives energy 60 J.
6×2=12,E=12×5=60
Four-to-eight turns also closes energy
Turns 4 to 8 double voltage from 8 V to 16 V. Primary power 16 W over 4 s gives energy 64 J.