A transformer with more primary turns than secondary turns will produce a secondary voltage higher than the primary voltage. O True O False

Calculate the peak voltage of a generator that rotates its 100-turn, 0.100 m diameter coil at 3600 rpm in a 0.800 T field.

A transformer is used to supply a 14.5 V model train with power from a 132V wall plug. The train operates at 64 W of power. (a) What is the current in the secondary coil of the transformer in ampere? (b) What is the current in the primary coil in ampere? (c) What is the ratio of the number of primary to secondary turns? (d) What type of transformer is this transformer

To ignite a mixture of gasoline and air inside an internal combustion engine--like in your car--a spark is generated by a high voltage across the spark plug, usually in the 10's of thousands of volts, but the battery is only 12 V. This massive increase in voltage is achieved through a transformer called the 'ignition coil'. A typical ignition coil has a primary with 300 turns wrapped around a radius of 2 cm over a linear distance of 15 cm. The secondary has 60,000 turns of wire over the same cylinder. The spark is generated when the current is suddenly shut off to the coil. Assuming that the magnetic field is uniform inside the primary and secondary coils, and that all of the magnetic field lines that go through the primary go through the secondary, what voltage is generated in the secondary coil if the current in the primary coil drops from 10 A to 0 A at a steady rate over the course of 50 mirco-seconds? Give your answer to 2 significant digits. Hint: Remember the definition of flux…

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} .

A transformer outside of a business steps the average voltage down from 3600 V to 120 V. The transformer delivers 1.50 × 106 W to the business at 82.0% efficiency. (Give answers to 3 sig.figs.) Find …     (a) the power delivered to the primary, (b) the current in the primary, and (c) the current in the secondary.