Chemical Effects of Electric Current PDF

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fhe piotures oven in at ig Look 142 arid find aemaking Chemical Effects of whal mistakes deating with themsctves from these peopla Al of eictricity fnust take ut them Cara to and CONOUCORS ANO SULATORS We havs studsd in earier classes that the rnaterials. efectric protect shocks. Which aliow Electric Current Have yo warn ever tried fo you not to think touch that wiy your stders arg conductors not allov electric Curront electic of current to electricity,Maternals, tG pass trirough thero wbich do always lsctoc pass through them 14 are wet aires wilh hands? it is so and Insulators. 9 switches you from because want to provent getting ar hey stectie Explore being a good Conductor of shock Water eiecticity Phy de we not secopoRr wire wiftcit inelation for betwcen the makes a wiring electric connection switches in tlow of current and your body resulting and We can find with the helo of a giving tester whether the shock you an olectric el8ctric CUrrent pass through a particular material Of not Let us pertorm an activity to know about conductors and insulators. learning points Key and insulators about Conductors Aim: To study Conductors: and Activity 1 The meaning of electncity insulators Required: A Materials torch bulb Conduction electricitythroughout liquids and its uses (15volt)fxed in of aluminium wire, cotton thread, a Electroplating holder, a dry ubber and things fike Chemical electnc current string, strips cell effects of coppetwire, iton wire. Connect the of paper Procedure: positive and and plastic negative terminals help copper wire as shown the cell to the the of of in Figure two terminas the buib holder wah is the smallest What do you of an atom a. part We know that of You find that the bulb alows observe? will Electricity is an essential part of modern living. IS charged partinl of negatively It matter. It consists Now, remove the copper wires. Again one of the most important of all forms of energy. positively charged particles of the bulb connect the to cel called the terminals called electron, holder with the Batery help It provides us with ight and heat, and operates called hread and neutral particles cotton of neutrons. The (Figure b). Does the bulb glow now? protons a variety of machinery, such as motor cars, is called electricity or make the flow of electrons electric Next, connections between the bulb refrigerators, television sets, ovens, pumps and flow from negative to positive with the help of some other and cell Current. Electrons materials rubber like heaters. Moreover, can power the huge engines current flows from of paper and plastic string, it whereas, p0sitive strips iron terminal, wire, aluminium and turn piece of wire, etc Observe of a high speed electric train a is called in which Fig This conventional case the (b)Coton (a) Copper wire terminal. bulb glows. Fig. thread to negative iron into a magnet. This is not In this chapter, Ohservation: You allL of current. will obServe direction that the bulb glows when is connected we learn more about the eftects of electricity. ike copper to the it wire, Iron wire cell with the help and ot will aluminium wire.The bulb materials the helo of does not glow when is connected materials like cotton to the it thread, rubber cell with strings, strips of paper Canclusion: It can be concluded and plastic. from the above activity that materials wire allow electric like copper vwire. iron current to pass through wire, aluminium them. On the other hand, brins of paper and plastic materials like cotton thread, do not allow electric rubber strings current to pass through (A) them We observe an electrician Heater working at the electric and aluminium wires covered with thin layer of poles. He generaly wears rubber gloves in his insulating materials like rubber, hands or uses tools PVC are used for which have rubber coating on (D) electric wiring. their handles. Similarly, in Wet hand Our homes, copper wires (C (E) Fig. 14.2 Fig. 14.1 Severalappliances runs on home electricity at 172Science 8 Chemical Efects of ElectricCurrent  Conducios Activity 2 Insulatos a tester laking Ihn heip of Silver electricihe Making olectric ourrent magnetic ligids conduct of Cotton Aim To show oftoct Gold Lemon juce or know that Requlred. vinegar, muwst electric Cimya5 Rubber Materlals placti Gurrent Aluminiu toster, cHcuit of bulb (LED) Yol effect When current produces a feetie Snows Coniductorl a or beaker, flows Liguid Plasics cup ang magnetic Iron neodle gets deflected. Even if Drfectitn Insulator battery compass the Mica temon iulc or tho doflection of the current Yestoj Brass Take some vinegar Procedure: it is snall, Wo can mako USe magnetic needle CommIOn sat solution Wood and connect to tho can 1. beaker this of Steel plastic cup or whether cirCut bo soon. nagnetic effect of of testor the cuIront in preparing Disiled 2. Paper the help another type water Frst, see with circuI aloctric of Moist fouch the baro tester air For tis, onds 3. Honey Glass proporly. Tap water Is working You Activity 3 will one another. 4. Kerosene two wires observethat witlh Leather the another shows that all parts of To make type of 1ester this tlhe Human body the bulb glows, cirouit Aim: Requirod: 5. Lernon juics Ebonite Carddboard electricity. tray of a Materials match Charcoal are conducting battery. Copper box 6. Milk Pure water of the wo wires into the needle, wire ends lemor compass Acids Dip the bare Place small 7.Tap care that the ends are not needle inside compass water Conduclor Dry air vinegar. Take Procedure: box tne more match Wrap an Copper juice or same time do not of electicC wire 8. Vegetable but at the tray arGund the oil 1 cm apart touch Compass needle is than in which placed, Now, tray other. end of the wire to one terminal connect |9.Vinegar each one free of a two-cell you notice? and let the other end of this wire From the we see that some liquids What do battery be free above table f the bulb glows,it one end the other Conduct of piece of wire to Observation & Conclusion: shows Connect the electricity, whereas some do not conduct the battery. A electricity. If it new of conducts does not other terminal tester it easily that the liquid glow, formed is free ends having two electricity. does not conduct the liquid Activity 4 Aim. To study the flow of electric current through distilled water. Materials Required: Distiled Bulb water, plastic cup or beaker, tester, bulb, baftery, copper wire. Procedure: Distilledwater is a very Another pure torm of water. tester You can obtain from your school science ends lab or a it free Fig. 14.3 Conductors the two of two wires. The compass car battery repair Touch shop or petrol pump. CELL deflection needle should show Think & Answer Baftery Lemon juiceor vinegar Now, repeat the activity 2 as soon as you using this tester. dip the free ends What do Bulb does obsenve of the you not glow Why are we advised not to touch electrical in lemon juice? Do you see a Copper wire deflection in the tester appliances with wet hands? Insight needle? compass What is the difference between conductors and as light emitting diode can be used for..take out the ends of the tester from lemon iuice. LED known Battery insulators? of electric bulb. LED bas dio them in water to clean the ends and then wipe them lighting in place Give examples of at leaSt five conductors and sought after light an Repeat the the capability to be more same activity using other liguids like five insulators. future in place of CFLS source in near fan water, vegetable milk, distilled water, common oil, Drstilled vwater when a small electric What is conventional current flow? LED glows even etc. salt solution, kerosene, Take some distilled water in a plastic cup or beaker. Duc to their high current flows through Use it. the tester to test the conductívity or distilled water. once they use but cost they are not in much It is necesary to wash, wipe and dry the ends of Observatior: You will observe that the bulb does not glow. CONDUCTION OF ELECTRICITY THROUGH LIQUIDS become cheap they will be of huge demand tester after using for testing each liquid. Observe Conclusion: This activity proves that distiied water it the market. show electricity and record which the magnetic compass in to the flow of in liquid Here is an activity does not conduct electricity through liquids. needle shows deflection. Science Chemical Effectsof ElectricCurrent 1 &  water is trss other hand Bit s On the an nolator sd huet tnsight eec electricity are conduct te that solutions Most iguids sats bases and of acids warned not to Th grs blue spot found around the wite Mhy you are always touch wbt connectd fo pasitiva terrint of the batar That is wet hands with of whie ng applance an electrncal water not Wiltiam ichoison (1753-18151 a 8itish Chemist wet fioor because pure but You wit see bubbies of standing on It is therefore good