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Tuesday, August 16, 2011

Physics Application: Electric Bell

Today's tips:

One important aspect in studying physics is the ability to apply & relate each physics concept. In SPM application part is vital as it always being asked in paper 2. You are expected to explain certain physics application such as the working principle of an electric bell. Usually there are 4 marks allocated for this type of question. However to explain it, u must fully understand the physics concept being applied. In the case of electric bell, we apply the concept of electromagnet.

Generally to understand basic concept of electromagnet, we must appreciate that every time current flows in a wire, magnetic field is produced. If the wire is coiled around soft iron, this causes the soft iron to be magnetized and become a temporary magnet. Once it becomes a magnet, it has the tendency to attract any magnetic materials such as iron armature in the bell.

Once u understand the basic concept, then u must practise to explain the working principle of an electric bell. Why dont u take a reference book,watch this video.. try to undertand and explain how it works ..





There are many other application of electromagnet such as relay switch,telephone ear piece, circuit breaker etc. Just make sure u are able to explain all of them.  

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