TNSB - 8 - Science :: Heat and Electricity

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Go To: TNSB-Science-Grade 8

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[Contributor - Gayathri Arun Kumar]


Dear Volunteer,

Please find below the detailed lesson plan and PPT for this chapter in the language mentioned against the respective link. While the lesson plan will give an overall flow of the lesson, the PPT will include lesson flow as well as the presentations for the class.


https://drive.google.com/open?id=1N6m4j51uzD4zl_rrpu0EkAGmZ_RUu0_l (Lesson Plan - English)


https://drive.google.com/open?id=1L49J2k-5V-eAZbsVbct1QgQtBFWxHm0U (PPT - Tamil)


You may use the content as it is or download and modify them to suit the students requirements.


If you feel any major modifications or additions are carried out by you in the form of adding any new activity, presentations, videos etc. we request you to send the modified version to submitcontent@evidyloka.org for enabling upload the modified version.


The worksheets of the lesson can be accessed from the worksheet tab.


Kindly rate the lesson plan and share your suggestions and comments on the lesson plan in the comments box below. Your valuble suggestions and comments will help us to improve the content.



[Contributor - Gayathri Arun Kumar]

Lesson Plan version 1.1 videos

https://www.youtube.com/watch?v=QzHdeA-2ARI (Introduction to electricity)

https://www.youtube.com/watch?v=2SK27m4A9Zk (introduction to electricity)

https://www.youtube.com/watch?v=VS45fVHdJ2U (parallel and series circuits - tamil)

https://www.youtube.com/watch?v=js7Q-r7G9ug (Series and parallel - English)

https://www.youtube.com/watch?v=mro7lJfSGc8 (Conductors and insulators - Tamil)

https://www.youtube.com/watch?v=vfx8rVbWwmw (Conductors and insulators - English)

https://www.youtube.com/watch?v=iG6m6vxl5RY (Conductors and insulators - Tamil)

https://www.youtube.com/watch?v=w0k2Bz3vmow (Chemical effects of electric current)

https://www.youtube.com/watch?v=q_fAauPKH4o (Electrodes , electrolysis, electrolytes)

https://www.youtube.com/watch?v=YjvJvcUt50o (LED - Tamil)

https://www.youtube.com/watch?v=tpPTyrpCM8M (LED - Tamil)

https://www.youtube.com/watch?v=LbpwocW8Rgw (Electroplating)

https://www.youtube.com/watch?v=FnJ0V7B7nKo (Electroplating)

https://www.youtube.com/watch?v=DRjlkp2tkNw (how to electroplate)

https://www.youtube.com/watch?v=7yOYSQ4YX-I (Electric charges at rest)

https://www.youtube.com/watch?v=zHJkJGBdvwE (Different types of charges)

https://www.youtube.com/watch?v=n_KLByT5Bjg (Electroscope - Tamil)

https://www.youtube.com/watch?v=4niTlOYYRYI (Lightining)

https://www.youtube.com/watch?v=4LgqZVnXOeY (Safety measures during lightning)

https://www.youtube.com/watch?v=I1AX6SINhFE

https://www.youtube.com/watch?v=ne8oPFTM_AU (English-Expansion of solids)

https://www.youtube.com/watch?v=ifrHogDujXw (Climate change- English)

https://www.youtube.com/watch?v=TDJEH4u45ms (conduction-Tamil)

https://www.youtube.com/watch?v=zF09v-1oUNY (Convection-Tamil)

https://www.youtube.com/watch?v=jq50VpdAU-0&vl=en (Radiation- Tamil)


[Contributor - Kripa S]


1. Ask the students to name a few things that are hot, cold.

2. Take three large mugs. Label them as A, B and C. Put cold water in mug A and hot water in mug B. Mix some cold and hot water in mug C. Now dip your left hand in mug A and the right hand in mug B. After keeping the hands in the two mugs for 2–3 minutes, put both the hands simultaneously in mug C. Do both the hands get the same feeling?


[Contributor - Gayathri Arun Kumar]

Lesson Plan version 1.1 activities

1. a. I remove the insulation at both ends of the wires, so that about 1 cm of the metal portion is exposed.

b. I join the two 1.5V cells. Now it becomes a battery.

c. I connect one end of a wire to the positive end of the battery.

d. I connect the other end of this wire to the three torch bulbholders placed end to end. 

e. I connect the end of the third bulb holder to a key, which in turn is connected to the negative end of the battery.

f. I close the key.

g. I see the three bulbs glowing.

h. Now, I remove one of the bulbs from its holder. I see that the other bulbs do not glow. This is my first circuit. Now, let me dismantle this circuit and construct another circuit.

2. Construct a circuit using two cells, an LED and connecting wires. Immerse the two free ends of the wires into a beaker containing water or any liquid without touching each other.

3. A balloon, a few bits of paper, a piece of wool. I place a few bits of paper on a table. I bring an inflated balloon near the paper bits. The paper bits are at rest. Now I rub the balloon with a piece of wool and bring it near the bits of paper.I find the paper bits jump and

stick to the balloon.

4. Two plastic straws, a piece of wool, a wooden block. I take a plastic straw, rub it with a piece of wool and place it on the wooden block. I take another straw, rub it with the piece of wool and bring it near the first straw. I notice the straws repel each other.

5. Take a glass rod and rub it with a piece of dry silk. Suspend this glass rod from its middle with a silk thread. Bring it close to another glass rod which is also rubbed with a silk piece. What happens? Now rub a plastic rod with a piece of wool. Suspend the plastic rod from its middle with a silk thread. Bring it close to another plastic rod that is also rubbed with wool. What happens? We observe that in the above two cases the suspended rods repel each other. Now bring the rubbed plastic rod near the suspended glass rod and watch what happens? We notice that the glass rod and the plastic rod get attracted towards each other.

6. Take a glass flask fitted with a one-holed stopper. Insert a thin glass tube and mark the water level in it. Now, heat it for a few minutes. There will be a steady rise in the water level. Note the water level and mark it as C. This shows that liquids expand on heating.

7. need a thin metal foil, a needle and a candle. I take the thin metal foil and fix it at the tip of the needle, so that it can rotate. I place this arrangement just above the flame of a burning candle. I see the metal foil slowly rotating. Observation: The air above the candle flame gets heated and the warm air that moves up makes the foil rotate.

8. need: A glass beaker, cold water, potassium permanganate crystals, a spirit lamp. I take a beaker of cold water and put some potassium permanganate crystals in it. I slowly heat the water. I can see the colour rising through the water. Observation: The water molecules rise up because of heating.


[Contributor - Ramkee]

https://drive.google.com/open?id=0BzNF2YyqQxJ-bVVueUt1SzVxRms

[Contributor - Gayathri Arun Kumar]

Lesson Plan version 1.1 PPT

https://drive.google.com/open?id=1L49J2k-5V-eAZbsVbct1QgQtBFWxHm0U (PPT - Tamil)


[Contributor - Preethi Saravanakumar]

Term Transliterated Term Translated Term
Electricity எலக்ட்ரிசிட்டி மின்னியல்
Heat ஹீட் வெப்பயியல்
Circuits செர்கியூட்ஸ் சுற்றுகள்
Simple Circuit சிம்பிள் செர்கியூட்ஸ் எளிய மின் சுற்று
Series and Parallel Circuits சீரீஸ் அண்ட் பாரலல் செர்கியூட்ஸ் தொடர் மற்றும் பக்கசுற்றுகள்
Chemical Effect கெமிக்கல் எபெக்ட் மின்னோட்டத்தின் வேதிவிளைவுகள்
Cathode கத்தோடு எதிர்மின்வாயிலும்
Anode ஆணோடு நேர்மின்வாயை
Electrorefining எலெக்ட்ரோரிபைனிங் மின்னாற் துய்மையாக்கல்
Electroplating எலெக்ட்ரோபிலேட்டிங் மின் முலாம் பூசுதல்
Zinc ஜின்க் துத்தநாகம்
Silver சில்வர் வெள்ளி
Gold கோல்ட் தங்கம்
Atom ஆட்டம் அணு
Friction ப்ரிக்சன் மின்னூட்டம்
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