A household adaptor uses a transformer whose primary is designed for a 120 V, 60 Hz…
PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A household adaptor uses a transformer whose primary is designed for a 120 V, 60 Hz supply and whose secondary is rated at 12 V, 6.0 A. When the adaptor operates at full-load, the efficiency of the transformer is 80 %.
(i) Calculate the power actually delivered to the load.
(ii) Determine the rms current drawn from the 120 V mains.
(iii) Compute the total power loss in the transformer at full-load.
(iv) If the copper loss accounts for 60 % of the total loss, find the copper loss in watts.