SPM Physics: DC Generator

As i promised earlier..i'll discuss on application of faraday's law..
From this law we can generate different magnitude of induced current..
I use the word generate..which from this word scientists have managed to come out with a brilliant device called a GENERATOR.

In SPM, we will learn 2 types of generator..
1. DC generator
2. AC generator.

For both cases u must know how to describe their working principle. U need also to compare the difference between the two. It came out in one of SPM paper through section B, which asked the student to convert an AC to DC generator. Moreover, u must be able to differentiate the difference between DC motor & DC generator.
As i've told u so many times..u must read all the application for each subtopic. Then find questions about them.. please don't take it for granted..

Before i move further, for those doesnt know what is DC & AC means..
DC=direct current, i.e the current flows in 1 direction
AC=Alternating current, current can flow frm different direction

Now..Lets anaylse their working principle
1. DC generator
DC generator consist of 4 basic parts:
magnet, coil, carbon brush & commutator.

Basic working principle:

• When the coil is rotated, side ab move upward, side cd moves downward.
• both sides cut the magnetic field
• induce current is produced, which then flows in the coil to external circuit
  
• commutator ensure the current flows in one direction
  

to understand this process better, watch this video...



i will discuss the comparison between AC & DC generator soon..meanwhile u can download the electromagnetic notes & look at the detail as well.

2. AC generator( to be continued)