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- https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electricity_and_Magnetism_(Tatum)/13%3A_Alternating_Current/13.10%3A_The_TransformerIn a transformer, the EMF induced in the secondary coil is equal to the number of turns in the secondary coil times the rate of change of magnetic flux; and the flux is proportional to the EMF applied...In a transformer, the EMF induced in the secondary coil is equal to the number of turns in the secondary coil times the rate of change of magnetic flux; and the flux is proportional to the EMF applied to the primary times the number of turns in the primary.
- https://phys.libretexts.org/Courses/Grand_Rapids_Community_College/PH246_Calculus_Physics_II_(2025)/10%3A_Alternating-Current_Circuits/10.07%3A_TransformersThe device that transforms voltages from one value to another using induction is the transformer. A transformer basically consists of two separated coils, or windings, wrapped around a soft iron core...The device that transforms voltages from one value to another using induction is the transformer. A transformer basically consists of two separated coils, or windings, wrapped around a soft iron core.
- https://phys.libretexts.org/Bookshelves/University_Physics/Book%3A_Introductory_Physics_-_Building_Models_to_Describe_Our_World_(Martin_Neary_Rinaldo_and_Woodman)/23%3A_Electromagnetic_Induction/23.05%3A_TransformersThe voltage in the primary coil is given by Faraday’s Law: ΔVp=NpdΦBdt as is the voltage in the secondary coil: \[\begin{aligned} \Delta V_s = ...The voltage in the primary coil is given by Faraday’s Law: ΔVp=NpdΦBdt as is the voltage in the secondary coil: ΔVs=NsdΦBdt Since the flux (and thus its time-derivative) are the same in both coils, we can isolate the time-derivative in each equation to obtain the relationship between the voltages in the two coils: \[\begin{aligned} \frac{\Delta V_p}{N_p}&=\frac{\Delta V_s}{N_s}\\[4p…
- https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_II_-_Thermodynamics_Electricity_and_Magnetism_(OpenStax)/15%3A_Alternating-Current_Circuits/15.07%3A_TransformersThe device that transforms voltages from one value to another using induction is the transformer. A transformer basically consists of two separated coils, or windings, wrapped around a soft iron core...The device that transforms voltages from one value to another using induction is the transformer. A transformer basically consists of two separated coils, or windings, wrapped around a soft iron core.
- https://phys.libretexts.org/Courses/Kettering_University/Electricity_and_Magnetism_with_Applications_to_Amateur_Radio_and_Wireless_Technology/09%3A_Electromagnetic_Induction/9.09%3A_TransformersThe device that transforms voltages from one value to another using induction is the transformer. A transformer basically consists of two separated coils, or windings, wrapped around a soft iron core...The device that transforms voltages from one value to another using induction is the transformer. A transformer basically consists of two separated coils, or windings, wrapped around a soft iron core.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/12%3A_Magnetism/12.05%3A_Electromagnetism/12.5.07%3A_TransformersYou can leave the knife switch closed and the current will continue to flow in the first circuit but no current is induced in the second circuit because the field is constant and therefore there is no...You can leave the knife switch closed and the current will continue to flow in the first circuit but no current is induced in the second circuit because the field is constant and therefore there is no relative motion between the field and the wire in the second circuit. When the knife switch is opened, the current in the first circuit ceases to flow and the magnetic field collapses back through the wire to zero.
- https://phys.libretexts.org/Courses/Berea_College/Introductory_Physics%3A_Berea_College/23%3A_Electromagnetic_Induction/23.05%3A_TransformersThe voltage in the primary coil is given by Faraday’s Law: ΔVp=NpdΦBdt as is the voltage in the secondary coil: \[\begin{aligned} \Delta V_s = ...The voltage in the primary coil is given by Faraday’s Law: ΔVp=NpdΦBdt as is the voltage in the secondary coil: ΔVs=NsdΦBdt Since the flux (and thus its time-derivative) are the same in both coils, we can isolate the time-derivative in each equation to obtain the relationship between the voltages in the two coils: \[\begin{aligned} \frac{\Delta V_p}{N_p}&=\frac{\Delta V_s}{N_s}\\ \t…
