. The Ontario high school physics. Pig. 544.—Series-wounddynamo. THE ELECTRIC MOTOR 449. Fio. 545.—Shunt-wounddynamo. tlirougli many turns of line wii-i; in tlui field coils, while themain current does work in the external circuit (Fig. 545),the dynamo is t^JiADit-ivowtid. This type is used where theoutput of current required is continuallychanging, but where the potential differ-ence between the bruslies must be keptconstant, as in incandescent lighting,power distributing, etc. The regulationis accomplished by suitable resistanceplaced in the shunt circuit to vary theamount of the exciting cu

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. The Ontario high school physics. Pig. 544.—Series-wounddynamo. THE ELECTRIC MOTOR 449. Fio. 545.—Shunt-wounddynamo. tlirougli many turns of line wii-i; in tlui field coils, while themain current does work in the external circuit (Fig. 545), the dynamo is t^JiADit-ivowtid. This type is used where theoutput of current required is continuallychanging, but where the potential differ-ence between the bruslies must be keptconstant, as in incandescent lighting, power distributing, etc. The regulationis accomplished by suitable resistanceplaced in the shunt circuit to vary theamount of the exciting current. The regulation is more nearly auto-matic in the compound-wound dynamo.In this form the fields contain both seriesand shunt coils. The field-magnets, of course, lose their strength when thecurrent ceases to flow, but the cores contain sufficient residual magnetism to cause the ma-chine to develop sufficientcurrent to pick up on thestart. 531. The Electric Motor. The purpose of the electricmotor is to transform theenergy of the electric currentinto mechanical motion. Itsconstr