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3 years ago

Explain how electricity is generated and distributed, and why it is so useful and powerful for modern society.

Physics

2 answers:

tester [92]3 years ago

4 0

Answer:

One of the ways by which electricity is generated is through hydroelectric generation.

Explanation:

There are various ways by which electricity can be generated, such as hydroelectric (water), geothermal, solar (with the use of photovaltaics).

Using the hydro-power as focus;

Electricity is generated in a power stations or power plants using coal, oil or natural gas as fuel which is used to generate heat.

The heat generated is in turn used to generate steam which is used to power a turbine by spinning it, the spinning turbine activates an electromechanical generator to produce electricity.

(However, in some power stations, with the use of a large water reservoir or dam, water is released from the reservoir and the water flows through the turbine, spinning it.)

The Electric generators transform kinetic energy into electricity and the principle at work is Faraday's law of electromagnetic induction.

The power generated is transmitted at high voltage and low current to substations, where the voltage is lowered so it can be sent on smaller power lines. It is then distributed to transformers in every neighborhood and the transformers also reduce the voltage so that the power that gets into our homes is safe for consumption (use).

Usefulness of Electricity;

The usefulness of electricity cuts across our everyday life, starting from lighting, cooking, laundry, source of power for gadgets and electrical appliances such as computers and TV set, water heater, refrigerator, public transportation systems.

Without electricity, there would be no access to any of the above mentioned necessities of life.

yarga [219]3 years ago

3 0

Answer:

Generation ----transmission---distribution

Explanation:

Electricity is generated from the generating station which could be (thermal, hydro, nuclear, coal etc) ,it is generated at a low voltage and is being step up to a higher voltage with the aid of transformers. This transformers step up and step down voltages from one level to another. At the transmission end they ensure the voltage get to the distribution end .the distribution end ensures the voltages are being supplied to nearby homes. The rated voltage for homes is 230v in some countries or 110V in other countries.

Electricity is useful and powerful for modern society because majority of the equipments in use today depends on electricity for use.which makes it very important.

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Two uniform solid cylinders, each rotating about its central (longitudinal) axis, have the same mass of 2.88 kg and rotate with

Tanya [424]

Answer:

(a) $K_{small}=4839.3J$

(b) $K_{larger}=17406.4J$

Explanation:

Given data

The angular velocity of two cylinders ω=257 rad/s

The mass of the two cylinders m=2.88 kg

The radius of small cylinder r₁=0.319 m

The radius of larger cylinder r₂=0.605 m

For Part (a)

The rotational kinetic energy of the cylinder is given by:

$K=\frac{1}{2}Iw^2$

Where I is rotational of inertia of solid cylinder about its central axis.

$K=\frac{1}{2}Iw^2\\ K=\frac{1}{2}(1/2mr^2)w^2$

Substitute the given values

$K_{small}=\frac{1}{4}(2.88kg)(0.319)^2(257rad/s)^2 \\K_{small}=4839.3J$

For Part (b)

$K=\frac{1}{2}Iw^2\\ K=\frac{1}{2}(1/2mr_{2}^2)w^2$

Substitute the given values

$K_{larger}=\frac{1}{4}mr_{2}^2w^2\\ K_{larger}=\frac{1}{4}(2.88kg)(0.605m)^2(257rad/s)^2\\ K_{larger}=17406.4J$

8 0

3 years ago

Explain how to determine the volume of an irregularly shaped object such as a rock

alexira [117]

If you have no way to accurately measure all of the object's bumps and dimples, then the only way to measure its volume is by means of fluid displacement.

-- Put some water into a graduated (marked) container, read the amount of water, drop the object into the container, and read the new volume in the container. The volume of the object is the difference between the two readings.

-- Alternatively, stand an unmarked container in a large pan, and fill it to the brim. Slowly slowly lower the object into the unmarked container, while the pan catches the water that overflows from it. When the object is completely down in the container, carefully remove the container from the pan, and measure the volume of the water in the pan. It's equal to the volume of the object.

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4 years ago

A 1600kg cannon fires a 5kg cannonball horizontally. The exit velocity of the cannonball is 80m/s and the barrel length is 2m. W

evablogger [386]

Answer:

a = 1600 m / s²

Explanation:

For this exercise we use the kinematics relations,

v² = v₀² + 2 a x

where v₀ is the initial velocity of the bullet, which as part of rest is zero, for the distance (x) we can assume that the gases accelerate along the entire trajectory of the cannon x = 2m

a = $\frac{v^2}{2x}$

let's calculate

a = $\frac{80^2}{2 \ 2}$

a = 1600 m / s²

7 0

3 years ago

A car travels 100 m while decelerating to 8 m/s in 5 s.<br> a) What was its initial speed?

viktelen [127]

Answer:

Vi = 32 [m/s]

Explanation:

In order to solve this problem we must use the following the two following kinematics equations.

$v_{f} =v_{i} - (a*t)\\$

The negative sign of the second term of the equation means that the velocity decreases, as indicated in the problem.

where:

Vf = final velocity = 8[m/s]

Vi = initial velocity [m/s]

a = acceleration = [m/s^2]

t = time = 5 [s]

Now replacing:

8 = Vi - 5*a

Vi = (8 + 5*a)

As we can see we have two unknowns the initial velocity and the acceleration, so we must use a second kinematics equation.

$v_{f}^{2} = v_{i}^{2} - (2*a*d)$

where:

d = distance = 100[m]

(8^2) = (8 + 5*a)^2 - (2*a*100)

64 = (64 + 80*a + 25*a^2) - 200*a

0 = 80*a - 200*a + 25*a^2

0 = - 120*a + 25*a^2

0 = 25*a(a - 4.8)

therefore:

a = 0 or a = 4.8 [m/s^2]

We choose the value of 4.8 as the acceleration value, since the zero value would not apply.

Returning to the first equation:

8 = Vi - (4.8*5)

Vi = 32 [m/s]

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3 years ago

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lapo4ka [179]

Answer:

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