An elementary book on electricity and magnetism and their applications . \ . Oil Channels Fig. 256. — View of the General Electric CompanysH-type of transformer ; assembled, and plan. 376 ELECTRICITY AND MAGNETISM use concentric cylindrical coils, which are the easiest to manu-facture. This arrangement is compact and more easily cooledthan either of the other forms. 254. Transformer ratio. We have already seen that, sincethe same number of lines of magnetic force pass through bothcoils, the total voltage in the primary coil is to the total voltagein the secondary coil as the number of turns in
An elementary book on electricity and magnetism and their applications . \ . Oil Channels Fig. 256. — View of the General Electric CompanysH-type of transformer ; assembled, and plan. 376 ELECTRICITY AND MAGNETISM use concentric cylindrical coils, which are the easiest to manu-facture. This arrangement is compact and more easily cooledthan either of the other forms. 254. Transformer ratio. We have already seen that, sincethe same number of lines of magnetic force pass through bothcoils, the total voltage in the primary coil is to the total voltagein the secondary coil as the number of turns in the primary isto the number of turns in the secondary. This may be ex-pressed in the following equation : Ep_ No. turns on primaryEa No. turns on secondary This ratio is known as the ratio of transformation. It shouldbe remembered, however, that the equation is strictly correctonly when there is no magnetic leakage. This is very nearlythe case in modern transformers. It can also be shown that at loads near or above full load thetransformer currents vary inversely a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
