Question

All except for the first two. Please help me out guys it would be greatly appreciated

Answer 1

3) E = 128.09[kw*h]; cost = 3203 [P] 4) see below. 5) See below 8) power input = 46.51[w];

Step-by-step explanation:

3)

For this analysis we can calculate the energy using unit elemination, we will put first the data that we know then, we can eleminate the units that we don't need, using the proper conversion factor.

`0.6[kW]*610[(min)/(day) ]*1[(day)/(1440min) ]*3[weeks]*7[(day)/(1 week) ]*24[(hr)/(1day) ]\\E = 128.09[kW*hr]`

`cost = E*[(25P)/(kw*h) ]\\cost = 128.09[kw*h]*25[(P)/(kw*h)]\\ cost = 3203[P]`

4)

Advantages

• This type of power generation does not allow the use of fossil fuels.
• Constant energy can be generated, as water can be stored in large dams ensuring system reliability.

Disadvantages

• It is necessary to decrease the flow of a river and possible effects in populations that remain after the point of the dam
• Damage to the ecosystem due to the construction of this generating plant, usually in wildlife sites.

5)

An electrical grid, electric grid or power grid, is an interconnected network for delivering electricity from producers to consumers. It consists of:

• Generating stations that produce electric power .

• Electrical substations for stepping electrical voltage up for transmission, or down for distribution

• High voltage transmission lines that carry power from distant sources to demand-centers

• Distribution lines that connect individual customers.

6)

A high power electric transformer takes a voltage generated in a power plant and decreases it to a voltage that can be used in residential or commercial equipment. When the transformer decreases the voltage, the current increases and vice versa, that is, when the voltage increases in the transformer, the current decreases, thus complying with the law of energy conservation.

7)

Step-up Transformer

A transformer in which the output (secondary) voltage is greater than its input (primary) voltage is called a step-up transformer. The step-up transformer decreases the output current for keeping the input and output power of the system equal.

Applications – Step-up transformer is used in transmission lines for transforming the high voltage produced by the alternator.The power loss of the transmission line is directly proportional to the square of the current flows through it.

Step-down Transformer

A transformer in which the output (secondary) voltage is less than its input (primary) voltage is called a step-down transformer. The number of turns on the primary of the transformer is greater than the turn on the secondary of the transformer, i.e., T2 < T1. The step-down transformer is shown in the figure below.

Applications – It is used for electrical isolation, in a power distribution network, for controlling the home appliances, in a doorbell, etc.

8)

We have the wasted energy Pw = 20[w], and we know that the total energy will be:

Ptotal = PG + Pw

where:

PG = power generated [w]

Pin = tinput power [w]

And the efficency give us the amout of power generated for the work.

PG = 0.57*Pin

we can find the Pin

Pin = 0.57*Pin + 20;

0.43*Pin = 20

Pin= 46.51[w]

The power is defined by the work done in one interval of time, so we need to find the work

Work = Power * time

work = 46.51[w]*4[hr]*3600[s/hr]

work = 669744[J]

9)

The coal is selected is dried and pulverized is passed to One devices that inject the coal with a burner to allow the ignition of the coal more easily, the fire generated is used to heat liquid water and convert it to steam, inside a equipment called Boiler.

El vapor generado en la caldera sale de esta a alta temperatura y alta presión y se pasa atravesar de una turbina, para que haga girar el eje de la turbina, acoplado a un generador eléctrico, de esta manera se genera electricidad.

9)

Energy from burning fossil fuels is converted into electricity and heat in power plants. When the fossils are burned coal and hydrogen react with oxygen producing carbon dioxide (CO2) and water (H2O).

Carbon dioxide (CO2) : This greenhouse gas is found in relatively low concentrations in the atmosphere at approximately 0.03%. Despite its low levels, it is the biggest driver of global warming.

That is the main reason to reduce the generation of CO2