A transmission line that has a resistance per unit length of 4.50 × 10-4 Ω/m is to be used to transmit 5.00 MW across 400 mi (6.44 × 105 m). The output voltage of the source is4.50 kV. (a) What is the line loss if a transformer is used to step up the voltage to 500 kV? (b) What fraction of the input power is lost to the line under these circumstances? (c) What If? What difficulties would be encountered in attempting to transmit the 5.00 MW at the source voltage of 4.50 kV?

The plug-in transformer for a laptop computer puts out 22.5 V and can supply a maximum current of 3.00 A. Find   the maximum input current if the input voltage is 240 V.

Please answer and box.

A typical wall outlet voltage in the United States is 120 volts. Personal MP3 players require much smaller voltages, typically 302.1 mV. If the number of turns in the primary coil is 35753575, calculate the number of turns NS on the secondary coil of the adapter transformer.

You decide to “go green" and use an exercise bike to power your home appliances. Assume that your exercise bike is rigged to generate electrical power with 60% efficiency. In other words, only 6/10 of the power you develop can be used to store electrical energy for later use. Consider your 3500-Watt central AC unit. You need to run this unit for 4 hours each day during the summer. If you can develop a sustained power of 300 Watts on your exercise bike, how long would you have to work out just to keep the AC running on a summer day?

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

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.

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.