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Class 10 Physics (India)

Course: Class 10 Physics (India)>Unit 4

Lesson 7: Electric generator & A.C.

A.C. & D.C. generator

Let's learn how A.C. and D.C. generators work. Created by Mahesh Shenoy.

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• At , how does the split ring make sure that current flows in one direction only? What is the role of a commutator?
• by reversing the direction of current after every half rotation. so that the part of rectangular coil on left side always experiences a upward force and partof rectangular coil at right side always experiences a downward force
(1 vote)
• At is the direction of current conventional current or flow of actual current (negative charges)?
• It’s conventional current as in physics we mostly refer to conventional current if it’s would have been electron current then it would have been mentioned.
(1 vote)
• Why, when moving electricity over a distance, is an AC dominant over DC? Why wouldn't DC be superior because of consistency?
• What does the term arcing of the brushes refer to in the DC generator? I'm guessing it will have something to do when it switches between the two split rings?
• every electrical connection with a potential difference has the potential to arc (jump the free space between connections) and brushes are a form of electrical contact
(1 vote)
• at why don't we use a commutator, just like we do in the way we use in electric motor??
• we dont use a commutator as a commutator is used used to change the direction for the current . but in a generator, magnetic field produces electricity . so in a generator you are supposed to move the wires not change direction of the current . thus we dont use split rings in a commutator in a generator.
(1 vote)
• arent there seperate places to connect positive and negative terminals in bulb.How can it accomodate the change in direction of current.
• if our houses receive ac current then why don't we have two fuses in the circuit?
• What is the source of the force that is rotating the conductor in the electric field ?
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• The magnets at each ends of the conductor.
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• why does the current always change after every half turn
(1 vote)
• You can use flemming's left hand rule to see. Also remember current flows from positive to negative.
(1 vote)
• Can't we turn an AC generator into a DC generator by just turning the rings in the AC generator into split-rings, and not changing anything else in the setup?
(1 vote)
• That is what is shown in the video. Nothing changed in the setup except for the slip rings into split rings, actually
(1 vote)