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# Power Conversion Efficiencies - Practical Application

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1. A steam turbine at an electric power plant delivers 4500 kW of power to an electrical generator that converts 95 percent of this mechanical energy into electrical energy. What is the current delivered by the generator if it delivers energy at 3600 V?

2. A color television draws about 2.5 A when it is connected to a 120 V outlet. Assuming electrical energy costs \$0.06 per kW*h, what is the cost of running the TV for exactly 8 h?

https://brainmass.com/physics/power/power-conversion-efficiencies-practical-application-19793

## SOLUTION This solution is FREE courtesy of BrainMass!

Power generated by the turbine = 4500kW = 4500 * 10^3 W

95 % of this gets converted to electrical energy.

That is 4500*10^3 * 95/100 gets converted to electrical energy.

ie, 45000*95 = 4.275*10^+6 W of electrical energy is generated

Power, P = Voltage x Current, voltage is given in the problem and we have calculated the power as 4.275*10^+6 W

Therefore, current = Power/Voltage = 4.275*10^+6 W/3600V

2. Similar to the earlier problem, power consumed by the TV set is given by,

P = V x I = 120 x 2.5 = 300 W = 0.3 kW

If we run it for 8 hrs, total energy consumed is, 0.3 * 8 = 2.4 kWh

Cost of 1 kWh is 0.06\$, hence the cost of 2.4kWh is

= 0.06 * 2.4 = 0.144 \$ ---Answer

This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!