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 r.m.s value of a supply voltage is quoted at…The primary coil of a transformer has N turns and is…A step-down transformer has a power output of 50 W…If the efficiency of a transformer is 100%; which of…A transformer with 55500 turns in its primary is…SEE ALSO The mechanism of heat transfer from one point to another through the vibration of the molecules of the medium is