The primary coil of an ideal transformer is connected to a 120 V source and draws 1.0 A. The secondary coil has 800 turns and supplies an output current of 10 A to run an electrical device. a) What is the voltage across the secondary coil? b) How many turns are in the primary coil? c) If the maximum power allowed by the device (before it is destroyed) is 240 W, what is the maximum input current to this transformer?

A transformer has 472 turns on its primary and 108 turns on its secondary. (a) Is this a step-up or a step-down transformer?   (b) If a voltage of 103 V is applied to the primary and a current of 0.4 A flows in these windings, what are the voltage output of the secondary and the current in the secondary?voltage  Vcurrent  A

In a well-designed transformer with an iron core, the secondary coil has twice as many turns as the primary coil. Which one of the followi statements concerning this transformer is true? OA This is a step-down transformer because the current in the secondary coil is less than that in the primary coll. OB The effect of the iron core is to reduce the magnetic field passing through the coils. C The induced emf generated in the secondary coil is twice as large as that generated in the primary coil. 9:44 PM O D. The flux that passes through each turn of the primary coil is twice the flux that passes through the secondary coil.

A generator has a 460-turn coil that is 10 cm long and 12 cm wide. The coil rotates at 9.0 rotations per second in a 0.10-T magnitude B→ field. A)Determine the generator's peak voltage.

The transformer on a utility pole steps the voltage down from 10000 V to 220 V for use in a college science building. During the day, the transformer delivers electric energy at the rate of 10.0 kW. a) Assuming the transformer to be ideal, during that time, what are the primary and secondary currents in the transformer? b) If the transformer is only 90 % efficient (but still delivers electric power at 10.0 kW), how does its input current compare to the ideal case? c) At what rate is heat lost in the nonideal transformer? d) If you wanted to keep the transformer cool and to do this needed to dissipate half of the joule heating of part c) using water cooling lines (the other half is taken care of by air cooling), what should be the rate of flow (in liters per minute) of water in the lines? Assume the input cool water is at 68∘∘F and the maximum allowable output water temperature is 98∘∘F} .

The primary coil in an ideal transformer has 1000 turns of wire and an emf of 100 V. The secondary coil has an emf of 10 V. How many turns of wire does the secondary coil have? 100 1000 10,000 100,000

A 6.00-V battery is connected across the primary coil of a transformer having 50 turns. If the secondary coil of the transformer has 100 turns, what voltage appears across the secondary?