The voltage and current in the primary of a transformer are 200V and 2A respectively. lf the transformer is used to light ten 12 V, 30 W bulbs, calculate its efficiency. By: Sunday|Published on: Aug 27|Categories: Physics WAEC| 0 comments A. 100% B. 90% C. 75% D. 50% Correct Answer: Option C – 75% Users Also Read These:The primary of a transformer has 100 turns and its…A step-down transformer has a power output of 50 W…A transformer has 300 turns of wire in the primary…Calculate the number of turns in the secondary coil…A transformer is required to supply 12 Vrms to…SEE ALSO An inductor of inductance 1.0H is connected in series with a capacitor of capacitance 2.0μF in an a.c. circuit. To resonate?