Electric current Photo by: Marc Dietrich An electric current is usually thought of as a flow of electrons. When two ends of a battery are connected to each other by means of a metal wire, electrons flow out of one end electrode or pole of the battery, through the wire, and into the opposite end of the battery. An electric current can also be thought of as a flow of positive "holes.
Conduction of Electricity Similar to many solids, some liquids also conduct electricity. Substances which allow electricity to pass through them are called conductors; such as silver, gold, acidic solution, salt solution, etc. Substances which do not allow electric current to pass through them are called insulators; such as plastic, rubber, etc.
Good conductor and Bad Conductor: Substances which allow electric current to pass through them easily are called good conductors of electricity; such as silver, gold, aluminium, etc.
Some substances allows electric current to pass through them but in very little amount. Therefore, such substances called bad conductors of electricity, rather than being called as insulator.
In fact, most of the substances allow electric current to pass through them under certain conditions, so instead of using terms conductors and insulators, good conductors and bad conductors are used.
Testing of conduction of electricity through liquid: Liquids; which contain salt dissolved in them; conduct electricity. The conduction of electricity through a liquid can be tested using two electrodes and a bulb.
But the conduction of electricity through the liquids which are poor conductor cannot be tested. But conduction of electricity Chemical effects of electric currents such liquids can be tested using LED or magnetic compass needle.
For this, you need a compass needle, an empty matchbox, two electric cells, some wires, a plastic bottle cap and the liquid which is to be tested. Keep the compass needle inside the empty tray of matchbox and wrap a couple of rubber bands around it.
Connect the wires to the battery and insert two wires in the liquid which is kept in the plastic bottle cap. You will observe that when the current flows through the wire, there is deflection in the compass needle. This shows that the given liquid conducts electricity.
In fact, magnetic compass needle can detect even feeble current. LED can also be used in place of compass needle. Salts; dissolved in water are responsible for conduction of electricity through water.
Tap water, acid solutions, basic solutions, etc. Distilled water is poor conductor of electricity because in no salt is present in distilled water. Chemical Effects of Electric Current When electric current is passed through a conducting solution, some chemical reaction takes place.
Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles. The above examples are some of the chemical effects of electric current.
The chemical reaction depends upon the type of solution through which electric current is passed. Electroplating is one of the chemical effects of electric current. Electroplating is a chemical process using which a metal is coated with a layer of another desired metal.
Electroplating is done to make the metals shiny. Electroplating is done over the articles made of iron to make the iron shiny and to prevent iron from getting rusted.
Example Wheel rims, handle of cycle, etc. In the process of electroplating, metal salt solution is taken in a container. Salt of metal is chosen which is to be coated over another metal. Metal which is to be coated is dipped in the solution and connected with negative pole.
Metal for desired coating is connected with positive pole. When electric current is passed through the solution, metal from anode is dissolved in the salt solution and deposited over the negative pole cathode. Thus, coating of desired metal is obtained on another metal.Low-frequency electric fields influence the human body just as they influence any other material made up of charged particles.
When electric fields act on conductive materials, they influence the distribution of electric charges at their surface. An electric shock occurs when a human body gets in contact with a source of voltage that is high enough to cause current flow.
There are thousands of people who die every year because of electric shock. Feb 17, · Introduction: By increasing population of the world, towns are expanding, many buildings construct near high voltage overhead power transmission lines.
The increase of power demand has increased the need for transmitting huge amount of power over long distances. Large transmission lines configurations with high voltage and current levels generate large values of electric and magnetic.
Chemical effects of electric current 1. MA IN 2. Conduction of Electricity Similar to many solids, some liquids also conduct electricity. Oct 13, · Electroplating is one of the chemical effects of electric current.
Electroplating is a chemical process using which a metal is coated with a layer of another desired metal. Electroplating is done to make the metals shiny/5().
Risks. Although ECT is generally safe, risks and side effects may include: Confusion. Immediately after treatment, you may experience confusion, which can last from a few minutes to several hours.