Skip to main content

Heat Effects of Electric Current | Conductor | Insulator | Common causes of Electrical Fire

WHAT IS THE HEAT EFFECT OF ELECTRIC CURRENT:

   When current passes through a conductor heat is produced. This is in fact the work that is required to be done is sending the current against the resistance, which is converted into heat.

Heat produce in the conductor is directly proportional to :

• Square of the current passing through conductor 12
• The resistance of the conductor 'R' and 
• The time of flow 't'

Combining the proportionality, we get,

H = 0.24121RT

Where, 'H' is heat produced in calories, 'T' is current in ampere resistance on ohm and 't' is the time of flow in second.

   The phenomenon is particularly important to Firefighter as so produce if not dissipated safety, will raise the temperature ultimately ignites the combustible materials available in the near.

What are Conductor & Insulator?




   Conductors are the materials which allow the flow of e.g. through them with least resistance, e.g. Copper, Alluminium, Iron, Water where is the internet hazaar the materials which do not allow the electrons through them. E.g. wood ( dry ), rubber, plastic, glass, mi.

Generation and Distribution of Electricity:



   The bulk production of electricity is done by converting other of energy voz,  heat and potential energy at place which are known power station. In india, the most common power plant include,
  • Thermal power station
  • Hydro-power station
  • Nuclear power station
   In a thermal power station coal is bruned to produce heat e.g. which is utilised in converting water into steam ( temperature about and pressure 150 kgf/cm2 ) which in turn runs the steam turoine the converting the pressure energy is further utilised in rotation the general produce electrical energy.
In hydro power station water is connected at her attitude when allowed to flow at lower level discharge water at high pressure, high pressure flow rotates the water turbine converting the pressure into mechanical energy which is subsequently utilise for running generator to produce electrical energy.
In a Nuclear power station, fissin reaction in a radio electro material allowed to take place in nuclear reaction which provides heat energy. This heat energy is used in converting water into stable running the turbine which gives mechanical energy. The mechanical energy so produce is used in running the generator to produce electricity.
The electricity produce at either of the three power station is a low pressure ( voltage ) current and since, for distributing electricity at distance places, high pressure ( voltage ) ignrequired and electrical equipment, namely transformer are used to increase the pressure and then through transmission lines electricity is transmitted to distance place. Since, low pressure ( voltage ) current is the requirement of the consumer. Hence, wherever tapping done stop down transformer are used to reduce the voltage depending upon the consumer requirement and then supplied to the users. Step up transformers are used at generating station where is step down transformer are you sad electrical sub-station.

Common Causes of Electrical Fire and Remideal Measures: 


Fire hazards of electrical origin maili due to the in proper use of electricity in proper electrical installation and let of arc in the maintenance of the electrical system and decorate fir mostly originated mostly from the sparx offer heating of electrical equipment switch maybe cause by the following :
  • Short circuitcircuit
  •  of insulation
  • Overheating of Electrical equipment
  • Improper selection of equipment/wiring
  • Loose electrical contacts
  • Discharge of static charge.
With few exceptions most of the fire originated by electricity can be prevented by :
  • Selecting the proper rating electrical equipment and wiring
  • Avoiding the excess loading of Electrical equipment
  • Using proper capacity fuse/circuit breaker
  • Ensuring effective earthing of Electrical equipment and in installation
  • Periodic inspection and testing of electrical circuit and equipments.



Stay Connect With Fire &  Industrial Safety Engineering and Keep Learning more.
Labels:

Comments

Post a Comment

Popular posts from this blog

(NRV) Non-Return Valves | Check Valves - Symbol, Types and Importance

(NRV) Non Return Valve A Non- Return Valves , check valve , clack valve, non- return valves , reflux valve, retention valve or one-way valve is a  valve that normally allows  fluid  ( liquid or gas ) to flow through it in one direction only.    Non  - Return valve/ Check valve are two-port valves, meaning that they have two openings in the body, one to enter the  fluid and the other to release the liquid. Types of (NRV) Non - Return Valves There are various types of check valves/non-return valve used in a wide variety of applications.  Non- return valves are often part of common household items.   Although they are available in a wide range of sizes and costs, Non - Return valve are generally very small, simple or inexpensive. Non - Return valve operate automatically and most are not controlled by an individual or any external control;  Accordingly, most have no valve handle or stem. The bodies (outer shells...
2 comments
Read more

21 Basic Rules of Scaffolding - Complete Guidelines on OSHA Scaffolding Safety Requirements

Complete Guideline on OSHA Scaffolding Safety Requirements Scaffolding Safety Requirements - With all of these safety practices in places, working on a scaffold can be a high without the dangerous lows.  21 Basic Rules of Scaffolding - Complete Guidelines on OSHA Scaffolding Safety Requirements. Follow the manufacturer instruction when a erecting the scaffold. Do not work on scaffold outside during strong or windy weather. Do not climb on skype old that wobble or lean to one side. Initially inspect the scaffold prior or mounting it. Do not use a scaffold if any pulley, block, hook or fitting is visible worn, cracked, rusted, or otherwise damaged. Do not use any scaffold if any rope is frayed, torn or visibly damaged. Do not use any scaffold tagged "Out of Service". Do not use unstable objects such as barrel's, boxes, loose brick or concrete block to support scaffold or planks.  Donot work on platform or scaffold unless they are fully planked. Do not use a scaffold unless...
Post a Comment
Read more

Introduction of Electricity | Fundamentals of Electricity | E.M.F Electromotive Force | Current | Resistance | What is Ohm's Law ?

ELECTRICITY General introduction of Electricity : Electricity is something really cannot be seen but its effect of felt. It may be define as a farm of energy energy can either be destroy not it can be generated it can only be converted from one from of energy to the another electricity is generated by converting other forms of energy that is thermal it energy nuclear energy and energy store in water potential energy similarly electricity can also be converted into other useful forms of energy visit energy mechanical energy light energy extra which find a wonderful application in our day to day life Fundamentals of Electricity : Electricity maybe define as the flow of electrons. The continue slow of electrons true and conductor is known as current and part of it flow is termed as electrical current. The dynamic electricity currencies of two times director and ( dc ) alternate current( ac ). The direct current always flows from positive terminal to negative. E.g. B...
Post a Comment
Read more