Why don't birds sitting on a high voltage wire get a shock?

Electricity travels from a place of high voltage to low voltage, just like water travels naturally from high elevation to low elevation. If the bird sits on a wire and also touches the ground, a path is created that allows electricity to travel through the body and to the place with no voltage. When electricity travels through the body of a bird in this fashion, electrocution takes place  and the bird dies. However, if the bird touches a single wire it do not get a shock because electric current passes through the wire instead of the bird.

What is a Substation ?

In India Power plants generates power at voltage 11 KV . Since, this voltage do not suffice to cover the large distance from power plant to our homes. To do this voltage raised from 11 KV to 220 KV / 400 KV and then these voltages should bring to 440 V or 230 V to use in our homes or industries. To do this we use Substations. In substations their is a Transformer which transmits the power from one voltage to another voltage. The is also some protecting devices like Breakers, Lightening Arresters which protect those lines from faults. 

How does electricity get to our homes?

Power plant converts the energy from the raw materials of the Earth into electric current.This is done with the help of huge generators, Which are driven by water, steam or wind. Electricity is transmitted at very high voltages through transmission towers to near the point of requirement of electricity and by the use of substations the voltage brings down to 230 V or 115 V to use at our homes or to use in industries at 440 V or above.

IE Rules 1956

IE Rules 1956

Pushkaralu- Kotilingala revu

కోటిలింగాలు ఎక్కడ ? http://nhunt.in/roH3 via NewsHunt.com

Meaning of Pushkaram

Pushkaram is a Sanskrit word meaning “the one who purifies”. Pushkaram is the time during which the rivers are worshipped. In India festivals are mainly the days that hold spiritual significances like birthdays of gods, goddesses, religious seers and saints apart from some national festivals. Among them Pushmaram is considered to be very sacred as the rivers in India are equivalent to goddesses. It is celebrated for 12 sacred rivers which represent 12 zodiac signs according to Hindu mythology and it comes once in 12 years.

Pushkaram comes for every 12 years and is the duration of the Jupiter entering and staying in the concerned zodiac sign. Each zodiac is associated with 12 rivers as follows: Ganges River with Aries; Narmada River with Taurus; Saraswati River with Gemini; Yamuna River with Cancer; Godavari River with Leo; Krishna River with Virgo; Kaveri River with Libra; Bhima River or Tambaraparni with Scorpio; Brahmaputra River with Sagittarius; Tungabhadra River with Capricorn; Indus River with Aquarius; Pranahita (tributary of Godavari) River with Pisces.

The first twelve days when the Jupiter enters a zodiac sign is called Adi Puskharam. The last 12 days when the Jupiter leaves a zodiac are called Antya Pushkaram. These 24 days are celebrated on the banks of the respective rivers with pomp and vigor. A holy dip taken in the waters of the rivers during Pushkaram will wash away all our sins. This is a very strong belief in Hinduism. Along with prayers, people also do rites to the ancestors on the banks of the rivers during the time of Pushkaram. It is believed that they will reach ultimate heavens emancipated from cycle of life and death because of these rites.

How to Determine Internal Resistance of a battery ?

Apparatus required:

 

One Battery, One Ammeter and one Voltmeter.

 

Experimental setup:

 

Voltmeter - Used to measure the open circuit voltage of the battery. 

Ammeter - Used to measure the short circuit current of the battery.

 

Fig 1-1                                 Fig 1-2 

 

S No	E0	Is	R = E0/Is	V	I	Remarks
1
2
3
4
5
6
7
8

 

                Experimental results are tabulated in observation table. The internal resistance of the battery  is given by:

 

                                                Open Circuit Voltage

                                 R =

                                                Short Circuit Current

 

Answer this Question.

EMQ1.  The company "Save Electricity the Smart Way" sells you a gadget that lovers the voltage of your electric water storage heater by 10% and saves electricity by 10% . The heater is rated at 2 KW at 230V . Do you agree with the claim of the company ? Support your opinion.


EMQ1.Ans: The answer is "No electricity saved". Due to the lower voltage the KW load will go down. Therefore the process to heat the water will take longer based on the energy balance. The electricity consumption in fact goes slightly up on paper.

What is a fuse?

The weakest point in a circuit is called fuse.