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SPM Form 5 Physics Revision Notes 22 May 2013 | 08:38 am
Chapter 8: Electromagnetism Revision - Magnetism Electromagnet Straight Wire Flat Coil Solenoid Apllication - Electric Bell Application - Electromagnetic Relay Application - Circuit Breaker A...
Introduction to Magnetism (Revision) 25 Jun 2008 | 02:32 am
You should have learned magnetism in form 3. In form 3, you learned that: A magnet can attract certain type of metal. The metals that can be attracted by a magnet are called the “magnetic materials”...
National Grid Network 18 Jun 2008 | 03:28 pm
What is a national Grid Network? A national Grid Network is a network of cable that connects all the power stations in a country to transmit electricity to the consumers throughout the nation. The ad...
Generation of Electricity 18 Jun 2008 | 03:27 pm
Renewable and Non-renewable Energy The frequently asked questions related to this topic are: what is renewable energy? the examples of Renewable and non-renewable energy and the advantages of using re...
Transmission of Electricity 18 Jun 2008 | 03:27 pm
Why the voltage is stepped up before transmitting electricity over long distance? Stepping up the voltage can reduces the current in the cable. This reduces the power loss in the cable during transmi...
Factors That Affect the Efficiency of a Transformer 18 Jun 2008 | 03:26 pm
Factors that affect the efficiency The heating effect of current in a coil. Power is lost as heat I2R whereby I is the current flowing through the coil and R is the resistance of the coil Methods to ...
Alternating Current 18 Jun 2008 | 03:25 pm
Direct Current Direct current (d.c) is usually supplied by acid-based batteries or dry cells. A common example of acid-based (electrolyte) batteries is the car battery. Direct current is uniform curre...
Transformer 18 Jun 2008 | 03:25 pm
[This image is original released under GNU Free Documentation license ] What is transformer? Transformer is a device that is used to raise or lower down the potential difference of an alternating cur...
Direct Current Generator 18 Jun 2008 | 03:24 pm
A simple d.c generator essentially the converse of a d.c. motor with its battery removed. Initially the armature is vertical. No cutting of magnetic flux occurs and hence induced current does not exi...
Alternating Current Generator 18 Jun 2008 | 03:24 pm
Generator can be modified to an a.c generator by replacing its commutators with two (separate) slip rings. The two slip rings rotate in tandem with the armature. Carbon brushes connect the armature to...
