Answer / promise mbanga

Looking at this question from the chemistry point of view,
l can confidently say:

(i) Coal in form of graphate, is a good conductor of
electricity due to a free electron wondering around it's
bonds, hence the resitance of earth reduces due to the
presents of coal.

(ii) Salt in solution for does ionise to Na+ and Cl-
ions. These ions are good conductors of electricity, hence
the earth resistance does reduces when salt is present on
earth.

(iii) Water does partially ionise to give H3O+ and OH- ions
which conduct electricity. This also reduces the earth's
resistance.

Answer / ankush miglani

the hard water is one of the good conductor of elecricity
as explained in ship earthing.
the mixing of these things in earth makes the earth
conductive n hence reduces the earth resistance.

Answer / gkumar

Hi,
Both coal & salt acts as good conductor of electricity .
also when they are mixed & put in the earthing pit they
provide conductivity as well as moisture for better passage
of current

Answer / p mishra

Coal are the form of graphite which is a best conductor.So
for reducing the earth resistance we use coal.Like salt is
made of Na+ Cl-.These ions are good conductors of
electricity, hence the earth resistance does reduces when
salt is present on earth. Water conducts partially. So all
the materials when mixed the resistance/ohmic value is
reduced.

what will be the effect on a bulb in case its connetion is change from live and neutral to live and ground??? 1) in case of single phase AC supply 2) in case of DC supply.......???

1 Answers  

---

We have 800KW motor operating at 6600Volt,50 Hz supply.During 1st startup it tripped on overcurrent trip.It's FLA is 88 Amps.The K factor of Thermal overloaaad was set on .94 initially.then we set at 0.97 and then it started fine.i dont understand why it tripped first?What are the protections which comes in picture during starting ?

6 Answers  

---

WHAT IS THE SHOPE TESTING

2 Answers   TATA,

---

whose motors self starting synchronous or Induction motor?give fact reason why not self starting another mother

2 Answers  

---

how does an encoder work???

0 Answers  

---

---

how to select the isolation tranformer for siemens 802dsl cnotroller

0 Answers   Siemens,

---

What are the components connected in between the power supply coming from an electric pole to HT & LT Panels in a large commercial building or how the power supply connected from Electric pole to Transformer & then to the HT & LT panels of a building? Please send me answers via mail, my id is yogiagarwal@gmail.com. If possible, please give a line diagram.

0 Answers   Ranbaxy,

---

In what way does the variable ratio-arm improve the usefulness of the wheatstone bridge?

1 Answers  

---

How to design a Unit auxiliary transformer for a power house having a unit of 65 MW and Generating voltage of 11 KV and Secondary voltage of 433V

0 Answers  

---

what is different between electrical ckt&electronic ckt

4 Answers   Ashok Leyland,

---

what is the function of a circuit breaker ?how does the circuit breaker function during normal operation of an electrical system

2 Answers  

---

why we used ZNO in Lightning arrester.

0 Answers  

---