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New videos from Khan Academy 2020-07-11T19:35:40.000000
Aggiornato: 12 min 29 sec fa

Functional groups

Ven, 2020-03-27 06:03
Functional groups are group of atoms or bonds that define the function of the hydrocarbon that they get attached to. Examples: Alcohol, Aldehyde, Ketone, Carboxylic acid, Halogens, Double & Triple covalent bonds. Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: Created by Ram Prakash

Groups influencing policy outcomes

Gio, 2020-03-26 20:09
How do political actors influence outcomes? In this video, Kim discusses when and how political parties, interest groups, bureaucratic agencies, and social movements may attempt to influence the policy process.

Live wire, neutral & ground (earth wire) - Domestic circuits (part 1)

Mar, 2020-03-24 15:25
The live wire of domestic circuits is usually red and is at high voltage. The neutral wire is black and has voltage close to that of the ground. The potential difference between these two wires in India is about 220 V. The earth or ground wire provides safety against faults and current leaks. Earth pin is longer to ensure earth connection happens first while connecting and last while disconnecting any devices.

Alternating current, direct current & what is frequency?

Mar, 2020-03-24 15:25
Current that keeps changing is direction is called alternating current, (AC) whereas the one that never changes its direction is called direct current (DC). Power can be transmitted with low heating losses in the form of AC (not DC). The frequency of the AC in India is 50 Hz. This means the current changes it's direction 100 times per second.

Overload & short circuit: Domestic circuits (Part 3)

Mar, 2020-03-24 15:25
Overload happens when current exceeds a safe value. Sometimes this happens due to voltage spikes. Attaching too many devices is also a very common cause. Sometimes there is a short circuit. A short circuit is when a very low resistance path is created, causing enormous amounts of current. For example, when a live wire touches a neutral wire, it creates a short circuit. Overload protection and short circuit protection can be done by using an electric fuse.

Domestic circuit connection & fuse - Domestic circuit (Part 2)

Mar, 2020-03-24 15:25
Let's explore how the domestic circuits are connected (whether in series or parallel). Also, let's learn how the fuse helps protect the domestic circuits from voltage surges. This helps us explore why we have two separate circuits, one for low power devices (with 5A fuse) and one for high power devices (with 15 A fuse).


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