A step-down transformer is used for recharging the batteries of portable electronic devices. The turns ratio N2/N₁ for a particular transformer used in a DVD player is 1:10. When used with 120-V (rms) household service, thetransformer draws an rms current of 32.5 mA from the house outlet.(a) Find the rms output voltage (in V) of the transformer.V(b) Find the power (in W) delivered to the DVD player.W(c) What If? What would be the current (in mA) drawn from the house outlet if the transformer had an efficiency of 85.0%, but the power delivered to the Blu-ray player remains the same?mA

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College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A step-down transformer is used for recharging the batteries of portable electronic devices. The turns ratio N,/N, for a particular transformer used in a DVD player is 1:15. When used with 120-V (rms) household service, the transformer draws an rms current of 24.0 mA from the house outlet. (a) Find the rms output voltage (in V) of the transformer. (b) Find the power (in W) delivered to the DVD player. W (c) What If? What would be the current (in mA) drawn from the house outlet if the transformer had an efficiency of 85.0%, but the power delivered to the Blu-ray player remains the same?
A transmission line that has a resistance per unit length of 4.20 ✕ 10-4 Ω /m is to be used to transmit 5.00 MW over 400 miles (6.44 ✕ 105 m). The output voltage of the generator is 4.50 kV. (a) What is the line loss if a transformer is used to step up the voltage to 430 kV? kW(b) What fraction of the input power is lost to the line under these circumstances?
The primary coil of a transformer has N₁ = 320 turns, and the secondary coil has N₂ = 2 190 turns. If the input voltage across the primary coil is Av(t) = 170 cos wt, where Av is in volts and t is in seconds, what rms voltage is developed across the secondary coil? V
A transformer is to be used to provide power for a computer disk drive that needs 5.6 V (rms) instead of the 120 V (rms) from the wall outlet. The number of turns in the primary is 420, and it delivers 500 mA (the secondary current) at an output voltage of 5.6 V (rms). (a) Should the transformer have more turns in the secondary compared to the primary, or fewer turns? O There should be more turns in the secondary. O There should be fewer turns in the secondary. (b) Find the current in the primary. (c) Find the number of turns in the secondary. turns
A step-down transformer is used for recharging the batteries of portable electronic devices. Theturns ratio N2/N1 for a particular transformer used in a DVD player is 1:13. When used with 120 V (rms)household services, the transformer draws an rms current of 20.0 mA from the house outlet. Find (a) therms output voltage of the transformer and (b) the power delivered to the DVD player.
A transformer on a pole near a factory steps the voltage down from 3,600 V (rms) to 120 V (rms). The transformer is to deliver 1960 kW to the factory at 88% efficiency. (a) Find the power delivered to the primary. kW (b) Find the current in the primary. A (c) Find the current in the secondary. Need Help? Read It
When a 2.0 µF capacitor is connected to a generator whose rms output is 34 V, the current in the circuit is observed to be 0.33 A. What is the frequency of the source? 772.4 Hz 2,426.5 Hz 594.1 Hz 1,544 Hz none
A step-up transformer connected to a 190 V line is used to supply a hydrogen-gas discharge tube with 5.6 kV (rms). The tube dissipates 78 W of power. (a) What is the ratio of the number of turns in the secondary winding to the number of turns in the primary winding? N. Np (b) What are the rms currents in the primary and secondary windings (in A)? Ip A Is A (c) What is the effective resistance (in 2) seen by the 190 V source? Ω
60 MW of power at 50 kV (rms) arrives at a town from a generator via 3.1 Ω transmission lines. Calculate the emf at the generator end of the lines. Calculate the fraction of the power generated that is wasted in the lines.

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