A transformer operates at full load under the following conditions.
PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A 2.0kW transformer operates at full load under the following conditions.
(i) Before modification: copper loss =120W, core loss =80W. Calculate its full-load efficiency.
(ii) After modification: the copper loss is reduced by 20% while the core loss remains the same. Calculate the new full-load efficiency.
(iii) Find the percentage increase in efficiency due to the modification (answer to one decimal place).