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Ask QuestionPosted by Mohd Zx 5 years, 3 months ago
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Meghna Thapar 5 years, 3 months ago
A commutator is a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine. On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.
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Posted by Anupama ?? 5 years, 3 months ago
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Khushi Shama 5 years, 3 months ago
Shivam Yadav 5 years, 3 months ago
Maahi ......♾ 5 years, 3 months ago
Posted by Anupama ?? 5 years, 3 months ago
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Meghna Thapar 5 years, 3 months ago
The definition of implication is something that is inferred. An example of implication is the policeman connecting a person to a crime even though there is no evidence. Cost implications refer to the amount of time, money, and energy required to obtain, produce and maintain a product or service. Research implications basically refer to impact that your research might have on future research or policy decision or the relevant field of interest of your study. ... For example, a clinical study might have implications for cancer research and might recommend against the use of a particular hazardous substance.
Posted by Vinay Waldia Waldia 5 years, 3 months ago
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Posted by Shubham Sinha 5 years, 3 months ago
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Anupama ?? 5 years, 3 months ago
Pravin Yedage 5 years, 3 months ago
Posted by Sehajpreet Kaur Brar 5 years, 3 months ago
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Riya Philip 5 years, 3 months ago
Posted by Priyanshu Nayak 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Urine is mainly composed of water. Nitrogen wastes like ammonia and urea are alos excreted in urine. Other common constituents are sodium, phosphates, sulfate, and creatine, urobilinogen, etc. in minute quantities. Normally, soluble substances are excreted in the urine.
Ankit Raj Gupta 5 years, 3 months ago
Posted by Disha Agarwal 5 years, 3 months ago
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Gaurav Seth 5 years, 3 months ago
A N S W E R
When sulphur dioxide is dissolved in water it forms sulphurous acid.
SO2+H2O⟶H2SO3
Posted by Rashmi Priyqdarshnj 5 years, 3 months ago
- 2 answers
Meghna Thapar 5 years, 2 months ago
Electric Motor:
An electric motor is a rotating device that converts electrical energy to mechanical energy. Electric motor is used as an important component in electric fans, refrigerators, mixers, washing machines, computers, MP3 players etc. An electric motor consists of a rectangular coil ABCD of insulated copper wire. The coil is placed between the two poles of a magnetic field such that the arm AB and CD are perpendicular to the direction of the magnetic field. The ends of the coil are connected to the two halves P and Q of a split ring. The inner sides of these halves are insulated and attached to an axle. The external conducting edges of P and Q touch two conducting stationary brushes X and Y, respectively. Current in the coil ABCD enters from the source battery through conducting brush X and flows back to the battery through brush Y. Notice that the current in arm AB of the coil flows from A to B. In arm CD it flows from C to D, that is, opposite to the direction of current through arm AB. On applying Fleming’s left hand rule for the direction of force on a current-carrying conductor in a magnetic field. The force acting on arm AB pushes it downwards while the force acting on arm CD pushes it upwards. Thus the coil and the axle O, mounted free to turn about an axis, rotate anti-clockwise. At half rotation, Q makes contact with the brush X and P with brush Y. Therefore the current in the coil gets reversed and flows along the path DCBA. A device that reverses the direction of flow of current through a circuit is called a commutator. In electric motors, the split ring acts as a commutator. The reversal of current also reverses the direction of force acting on the two arms AB and CD. Thus the arm AB of the coil that was earlier pushed down is now pushed up and the arm CD previously pushed up is now pushed down. Therefore the coil and the axle rotate half a turn more in the same direction. The reversing of the current is repeated at each half rotation, giving rise to a continuous rotation of the coil and to the axle.
The commercial use of motor:
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- An electromagnet in place of permanent magnet.
- Large number of turns of the conducting wire in the current-carrying coil.
- A soft iron core on which the coil is wound.
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The soft iron core, on which the coil is wound, plus the coils, is called an armature.
Posted by Rajveer Soni 5 years, 3 months ago
- 2 answers
Gaurav Seth 5 years, 3 months ago
ANSWER
Bishnoi is a tribal community in Rajasthan. For Bishnoi people, protecting wildlife is a religion. A well-remarked case study for the conservation of forests by Bishnoi people is of Amrita Devi Bishnoi who sacrificed her life for protecting 'Khejri' trees. She literally hugged the tree and dared King's men to cut her first before the tree. The King's men didn't bother about her and cut down trees along with her. 363 other Bishnoi people followed her and sacrificed their lives for the protection of sacred 'khejrali' forest. In the memory and honour of Bishnoi people who sacrificed their lives for the protection of forests, Amrita Devi Bishnoi Wildlife Protection Award was initiated.
Yogita Ingle 5 years, 3 months ago
Conservation of forests and wildlife is necessary to protect the biodiversity. This is important because loss of biodiversity leads to ecological imbalance. But any conservation effort for forest and wildlife must keep the interests of all stakeholders in mind.
Posted by Gurpreet Kaur 5 years, 3 months ago
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Gaurav Seth 5 years, 3 months ago
When resistors are connected in parallel, the supply current is equal to the sum of the currents through each resistor. In other words, the currents in the branches of a parallel circuit add up to the supply current.
Also, they have the same potential difference across them. In other words, any components in parallel have the same potential difference across them. And, the total resistance will always be lesser than the least resistance in the circuit.
The total resistance is calculated as
<div>1/Req = 1/R₁ + 1/R₂ + 1/R₃ + 1/R₄ + ....... + 1/Rn </div> <div>∴ for finding minimum resistance , we have to join all resistors in parallel.So , 1/Req = 1/(1/5) + 1/(1/5) + 1/(1/5) + 1/(1/5) + 1/(1/5)
1/Req = 5 + 5 + 5 + 5 + 5 = 25
Req = 1/25 Ω
Hence , minimum resistance = 1/25 Ω</div>
Posted by ಹರ್ಷನಂದ ಹರ್ಷನಂದ 5 years, 3 months ago
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Singh Krishna 5 years, 3 months ago
Khushi Sambharia 5 years, 3 months ago
Posted by Hitesh Kumar 5 years, 3 months ago
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Meghna Thapar 5 years, 2 months ago
Newland’s law of Octaves explains when elements are arranged by increasing atomic mass, the properties of every eighth element starting from any element are a repetition of the properties of the starting element.
It was discarded because:
1. This classification did not work with heavier elements,i.e. those lying beyond calcium.
2. Newland adjusted two elements cobalt and nickel in the same slot and these were placed in the same column as flourine , chlorine, and bromine which have different properties than these elements.
3. Iron, which resembles cobalt and nickel in properties has been placed far away from these elements.
Posted by Dhanshree Mane 5 years, 3 months ago
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Shivam Yadav 5 years, 3 months ago
Anupama ?? 5 years, 3 months ago
Yogita Ingle 5 years, 3 months ago
Chemical reactions- The transformation of chemical substance into a new chemical substance by making and breaking of bonds between different atoms is known as Chemical Reaction.
Posted by Kavita Rajput 5 years, 3 months ago
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Gaurav Seth 5 years, 3 months ago
When hydrochloric acid (HCl) and sodium hydroxide (NaOH) react with each other, neutralization reaction takes place and there is the formation of salt (sodium chloride NaCl) and water.
The acid releases hydrogen ion H+ which combines with the hydroxyl ion (OH−) released by the base, to form water. The anion of the acid and cation of the base combine together to form the salt.
HCl+NaOH→NaCl+H2O
Posted by Varun Pant 5 years, 3 months ago
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Gaurav Seth 5 years, 3 months ago
Transportation In Human Beings
<time datetime="2018-08-20T06:04:34+00:00" itemprop="datePublished">August 20, 2018</time> by <a href="https://www.aplustopper.com/author/veerendra/" itemprop="url" rel="author">Veerendra</a>
</header>Transportation In Human Beings
In humans, transportation of oxygen nutrients, hormone and other substances to tissue, CO2 to the lungs and waste products to the kidneys is carried out by a well-defined Circulatory System. In lower organisms material is transported by diffusion.
Circulatory System:
It comprises of the heart, blood vessels, blood, lymphatic vessels, lymph, which together serve to transport materials, throughout the body.
Components of the circulatory system in higher animals are –
- Blood
- Pumping organ- ‘Heart’
- System of blood vessels for distribution and collection of blood – consisting of arteries, veins and capillaries.
Click on the given link :
<a href="https://www.aplustopper.com/transportation-in-human-beings/#:~:text=In%20humans%2C%20transportation%20of%20oxygen,material%20is%20transported%20by%20diffusion.">https://www.aplustopper.com/transportation-in-human-beings/#:~:text=In%20humans%2C%20transportation%20of%20oxygen,material%20is%20transported%20by%20diffusion.</a>
Posted by Gautam Choudhury 5 years, 3 months ago
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Posted by Akshita Akshita 5 years, 3 months ago
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Parv Jain 5 years, 3 months ago
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Amrita Kumari 5 years, 3 months ago
Posted by Akshita Akshita 5 years, 3 months ago
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Adina Anthony 5 years, 3 months ago
Posted by Satyam Lodhi Rajput 5 years, 3 months ago
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Gaurav Seth 5 years, 3 months ago
Quantum theory of light is based on the idea that light is emited as discrete bundles or packets of energy. These packets are called quanta, and the particle of light was given the name photon.
The energy of one quantum is given by, hν , where h is the Plank's constant and ν is the frequency.
Posted by Satyam Lodhi Rajput 5 years, 3 months ago
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Âbhîshêk Kûmâr 32 5 years, 3 months ago
Akshita Akshita 5 years, 3 months ago
Posted by Satyam Lodhi Rajput 5 years, 3 months ago
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Gaurav Seth 5 years, 3 months ago
Copper
Copper does not react with cold water, hot water or steam however iron reacts with steam. If water tanks are made of steel which is an iron alloy than iron would react with steam formed from hot water.
3Fe+4H2O→Fe3O4+4H2
Posted by Satyam Lodhi Rajput 5 years, 3 months ago
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Posted by Satyam Lodhi Rajput 5 years, 3 months ago
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Amrita Kumari 5 years, 3 months ago
Posted by Ranjan Dutta 5 years, 2 months ago
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Amrita Kumari 5 years, 3 months ago
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Riya Philip 5 years, 3 months ago
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