The voltage across the terminals of a generator is 5.7 v when it supplies a current of 0.3 A. It becomes 5.1 V when I=0.9A. Find its emf and it's internal resistance

Answers

Answer 1

Answer:

The emf of the generator is 6VThe internal resistance of the generator is 1 Ω

Explanation:

Given;

terminal voltage, V = 5.7 V, when the current, I = 0.3 A

terminal voltage, V = 5.1 V, when the current, I = 0.9 A

The emf of the generator is calculated as;

E = V + Ir

where;

E is the emf of the generator

r is the internal resistance

First case:

E = 5.7   + 0.3r -------- (1)

Second case:

E = 5.1 + 0.9r -------- (2)

Since the emf E, is constant in both equations, we will have the following;

5.1 + 0.9r = 5.7   + 0.3r  

collect similar terms together;

0.9r - 0.3r = 5.7 - 5.1

0.6r = 0.6

r = 0.6/0.6

r = 1 Ω

Now, determine the emf of the generator;

E = V + Ir

E = 5.1 + 0.9x1

E = 5.1 + 0.9

E = 6 V


Related Questions

plaque contains billions of bacteria true or false

Answers

Answer:

true

Explanation:

Answer: True

Explanation:

How are gamma rays used for communication?​

Answers

Answer:

No

Explanation:

Electromagnetic radiation is used for communications and transmission of information. The waves that are used in this way are radio waves, microwaves, infrared radiation and light.

Joel uses a force of 50 Newtons to hold two weights 0.60 meters above his head. How much work is Joel doing on the weights?

Answers

30 J w=(force)(displacement) so W=(50N)(.6m) which equals 30J

does uranium use steam?

Answers

Answer:

Yes.

Explanation:

Reactors use uranium for nuclear fuel. The uranium is processed into small ceramic pellets and stacked together onto sealed metal tubes called fuel rods. The heat created by fission turns the water into steam.

Speed = Distance Time Velocity = 1. Find the velocity of a truck that travels 75miles north in 2.5 hours? List: Equation: Substitution: Answer with units:​

Answers

Answer:

187.5 m/s (i think)

Explanation:

If you use the formula V= T times displacement you can find this out by doing the following-

Displacement equals 75 m

T equals 2.5 hrs

75x2.5= 187.5

and since velocity is measured in m/s, it becomes

187.5 m/s

The first mineral to melt from a rock is

Answers

Answer:

Quartz

Explanation:

Answer:

Quartz

Explanation:

The temperature must be high enough to melt at least some minerals in the rock. The first mineral to melt from a rock will be quartz

A tugboat is pulling a barge into a harbor. The barge is exerting a force of 3000 N against the tugboat.

Answers

Available options are:

A. –4500 N

B. –2500 N

C. 2500 N

D. 4500 N

Answer:

-4500 N

Explanation:

Given that we have F₁ = 3000N? (force of the barge)

the force of the tugboat is F '

To pull the barge, the force of the tugboat must be greater than or equal to the force of the barge.

Hence, according to Newton's third law which states that for every action or force in nature, there is an opposite reaction.

Therefore considering the available option the correct answer is "- 4500N, " this is because it is greater than the force of the barge and it's in opposition to the force exerted.

Answer:

The answer is -4500 N

Explanation:

CAN A BRAINLEST HELP PLEASE!!!


The diagram below represents a rope along which
two wave pulses of equal amplitude, A, approach
point P

Answers

Might be A good luck

What has more kinetic energy 15 kg ball rolling north at 15 m/s or a 15 kg ball rolling backwards at 7m/s

Answers

Answer:

15 kg ball

Explanation:

which of the following is an example of potential energy:
(choose 1)

- a printer that is not connected
- your cellphone, when you make a call to someone

Answers

A printer that is not connecting

What is the geocentric angle of the earthquake focus?​

Answers

Answer:

epicenter

Explanation:

the epicenter Is d point directly above it at the structure of the earth

A box weighs 25N. How much mass does it have?

Answers

Explanation:

If box weight 25N on ground

MA=F

M(10)=25

M=2.5Kg

PLEASE HELPPPPP!!!!! ILL GIVE CROWN

Denver, Colorado is located near the rocky mountains. Which list of controls below would have the strongest influence on the weather in Denver.

A ) Ocean currents, distance from large bodies of water, and altitudes
B ) Altitude, topography, and ocean currents.
C ) Latitude, altitude, and topography
D ) Topography, ocean currents, and latitude.

Answers

Answer:To understand the regional and local climates of Colorado, you must begin with a basic knowledge of Colorado's topography. Colorado lies astride the highest mountains of the Continental Divide. Nearly rectangular, its north and south boundaries are the 41° and 37° N. parallels, and the east and went boundaries are the 102° and 109° W. meridians. It is eighth in size among the 50 states, with an area of over 104,000 square miles. Although known for its mountains, nearly 40 percent of its area is taken up by the eastern high plains.

Of particular importance to the climate are Colorado's interior continental location in the middle latitudes, the high elevation of the entire region, and the mountains and ranges extending north and south approximately through the middle of the State. With an average altitude of about 6,800 feet above sea level, Colorado is the highest contiguous State in the Union. Roughly three-quarters of the Nation's land above 10,000 feet altitude lies within its borders. The State has 59 mountains 14,000 feet or higher, and about 830 mountains between 11,000 and 14,000 feet in elevation.

Explanation:

Answer:

D

Explanation:

Hope this helps :)

Helppp!!!!! Please!!
A 0.144 kg baseball approaches a batter with a speed of . The batter lines the ball directly back to the pitcher with a speed of . Find the impulse exerted on the ball . If the bat and ball were in contact for 0.012 sec , find the average force exerted on the ball by the bat 20 m/s 30 m/s

Answers

Complete question:

A 0.144 kg baseball approaches a batter with a speed of 20m/s . The batter lines the ball directly back to the pitcher with a speed of 30m/s . Find the impulse exerted on the ball . If the bat and ball were in contact for 0.012 sec , find the average force exerted on the ball by the bat

Answer:

(1) The impulse exerted by the ball is 7.2 kg.m/s

(2) The average force exerted on the ball by the bat is 600 N.

Explanation:

Given;

mass of the baseball, m = 0.144 kg

velocity of the baseball, v₁ = 20 m/s

velocity of the batter, v₂ = -30 m/s (opposite direction to the ball's speed)

The impulse exerted by the ball is calculated as follows;

J = ΔP = mv₁ - mv₂

ΔP = m(v₁ - v₂)

ΔP = 0.144 [20 - (-30)]

ΔP = 0.144 ( 20 + 30 )

ΔP = 0.144 (50)

ΔP = 7.2 kg.m/s

The average force exerted on the ball by the bat is calculated as;

[tex]F = \frac{\Delta P }{t} \\\\where; t \ is \ time \ of \ contact= 0.012 \ s\\\\F = \frac{7.2}{0.012} \\\\F = 600 \ N[/tex]

Why are images reflected from a rough surface not as clear as those reflected from a smooth
surface?

Answers

Answer:

Just as images are reflected from the surface of a mirror, light reflected from a smooth water surface also produced a clear image. ... Consequently, the outgoing rays are reflected at many different angles and the image is disrupted. Reflection from such a rough surface is called diffuse reflection and appears matte.

Explanation:

hi po I hope it's help you

b. What is the man's weight on Mars where the acceleration due to gravity is
3.7 m/s2 ? Show your answer in both Newtons and pounds.

Answers

Answer:

How much is the mass of man?

DESPERATE WILL GIVE BRAINLIST AND THANKS
Which condition would have resulted from the functions of prokaryotes on early Earth?

Earth's oceans grew larger


less oxygen gas became present in the atmosphere


less carbon became present in Earth's soil


more oxygen gas became present in the atmosphere

Answers

Hope this helps!
the answer is B.

Answer: D. more oxygen gas became present in the atmosphere

Explanation:

I just took the test and that was the answer

Hurry up i need help.
The average kinetic energy of the particles of two pieces of iron at the same temperature and mass would be __________.


Question 1 options:


Different



The same



Not equivilent



With in 500 degrees of eachother

Answers

Answer:

The answer would be B) The Same

Explanation:

Not gonna lie I checked my class notes but I figured this would help :)

Good luck!!!

Law of superstition which was deposited first

Answers

Answer:

E is the answer.

Explanation:

Determine the kinetic energy (in joules) of a 1000 kg roller coaster car that is moving with a speed of 25.0 m/s?

Answers

The correct answer is 312,500j

Explanation : using KE formula 1/2 m v^2 .

The current in the wires of a circuit is 60.0 milliAmps. If the
voltage impressed across the ends of the circuit were
doubled and the resistance were tripled, then its new current
would be ___ milliAmps.

Answers

Answer:

I' = 40 mA

Explanation:

Given that,

The current in the wires of a circuit is 60.0 mA.

If the  voltage impressed across the ends of the circuit were  doubled and the resistance were tripled such that,

V' = 2V and R'=3R

The relation between current, voltage and resistance is given by :

V = IR

Let I' be the new current. So,

V'=I'R'

⇒ [tex]I'=\dfrac{V'}{R'}\\\\I'=\dfrac{2V}{3R}\\\\I'=\dfrac{2}{3}\times \dfrac{V}{R}\\\\I'=\dfrac{2}{3}\times I\\\\I'=\dfrac{2}{3}\times 60\\\\I'=40\ mA[/tex]

So, the new current would be 40 mA.

What happens to the arrangement of atoms in matter as it is heated?

Answers

Answer:

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance.

Explanation:

Atoms speed up and create more energy/heat.

1 point
Question 11
A swimmer feels cold after leaving warm water on a warm, windy day.
Why does she feel cold even though the air is warm?
A. The less energetic water molecules on her skin escape quickly.
B. The more energetic water molecules on her skin do not escape quickly.
С The water on her skin does not evaporate quickly enough to keep her warm.
D. The water on her skin evaporates quickly and cools her skin.

Answers

Answer:

D. The water on her skin evaporates quickly and cools her skin.

Explanation:

Correct the following statement:
Wind is caused by the revolution of the Earth around the Sun.
O Wind is caused by the rotation of the Earth.
O Wind is caused by the differences in air pressure on Earth's surface.
This statement is already correct.
O Wind is caused by the greenhouse effect.

Answers

Answer:

It's the 3rd option

Explanation:

Wind is caused by the differences in air pressure on Earth's surface.

A food has 2 grams of protein, 2 grams of carbs, and 2 grams of fat. How many total calories does this food have? HELP

Answers

Answer: 6 grams

Explanation:

Cause 2+2+2=6

A 0.144 kg baseball approaches a batter with a speed of . The batter lines the ball directly back to the pitcher with a speed of . Find the impulse exerted on the ball . If the bat and ball were in contact for 0.012 sec , find the average force exerted on the ball by the bat 20 m/s 30 m/s.

Answers

Answer:

What you say ¡

no pagal

Mayur is very very shame

Sorry

The hot resistance of a 125V filament lamp is 500Ω. Determine the current taken by the lamp and its power rating.

Answers

Answer:

0.25 amps

Explanation:

V = IR

125 = I(500)

I = 0.25 amps

HELP ME PLEASE I need the answer now and I will give all my brain lists

Answers

Answer:

I'd say it's B

Sorry if I get you wrong-

create a formula giving the strength of the induced field (B) i terms of current (I) and the distance from the wire to the probe (d)

Answers

If this is a long straight wire, then you probably mean:
B = μ₀I/(2πd)

What is the net force acting on a jet that has a mass of 130,000kg and it accelerates at a rate of 6m/s as it takes off

Answers

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