alexander3133

Tests are performed on a 50Hz transformer which yield the following results: Short circuit test: primary voltage = 40V, primary current = 10A, Power input = 20W Open circuit test: primary = 240V, primary current = 1.2A, Power input = 70W Determine the equivalent circuit parameters, the turns ratio and the regulation of the transformer assuming that the rated primary voltage is 240V @ 50Hz and the rated secondary current referred to the primary is 10A. The equivalent circuit parameters is not a problem to me, the only problems was to find the turns ratio and the regulation. I was told that the turns ratio can be found in open circuit test, but how?and also the regulation.

An air-filled parallel-plate capacitor with plate separation d and plate area A is connected to a battery which supplies a voltage Vo between plates. With the battery left connected, the plates are moved apart to a distance of 10d. Determine by what factor each of the following quantities changes: a) Vo b) capacitance, C c) electric field, E d) electric flux density, D e) charge, Q f) charge density g) energy stored, U An explaination on each answer will be highly appreciate, thanks.