![]() ![]() Notice that the volts per turn arethe same for both primary and secondary windings.Since the counter emf in the primary isequal (or almost) to the applied voltage, a proportion may be set up toexpress the value of the voltage induced in terms of the voltage appliedto the primary and the number of turns in each winding. Since the flux induces one volt per turn, the total voltageacross the secondary is two volts. Sincethe same flux lines cut the turns in both the secondary and the primary,each turn will have an emf of one volt induced into it. This means that if the voltage applied to the primarywinding is 10 volts, the counter emf in the primary is almost 10 volts.Thus, each turn in the primary will have an induced counter emf ofapproximately one-tenth of the total applied voltage, or one volt. Since the length of the wire in thesecondary is approximately the same as the length of the wire in eachturn in the primary,EMF INDUCED INTO THE SECONDARY WILL BE THESAME AS THE EMF INDUCED INTO EACH TURN INTHE PRIMARY. You know that as lines of flux generated by the primaryexpand and collapse, they cut BOTH the ten turns of the primary and thesingle turn of the secondary. ![]() Part (A) of the figure shows a transformer whose primaryconsists of ten turns of wire and whose secondary consists of a singleturn of wire. TURNS AND VOLTAGE RATIOS Turns and Voltage ratiosTURNS AND VOLTAGE RATIOSThe total voltage induced into thesecondary winding of a transformer is determined mainly by the RATIO ofthe number of turns in the primary to the number of turns in thesecondary, and by the amount of voltage applied to the primary. ![]()
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