Transformer Efficiency — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Transformer Voltage Ratio This relationship holds true for ideal transformers operating with alternating current (AC) voltage. The magnetic flux ( ) linked by the primary coil induces an EMF in the secondary coil. The induced EMF (voltage) is directly proportional to the number of turns (N) and the magnetic flux ( N ). For an ideal transformer, the ratio of induced voltages is equal to the ratio of the number of turns. Thus, V s V p = N s N p = k The transformer must be ideal (no energy loss due to resistance or leakage flux). The primary and secondary coils must be wound around a common magnetic core. N p and N s must be non-zero. Confusing the voltage ratio (V s/V p) with the current ratio (I s/I p). Assuming the relationship holds for DC circuits (it requires AC for mutual induction). Mistaking the voltage ratio for the efficiency ratio.