Types of Transformer

Types of Transformer There are 2 types of transformers, namely the step-up transformer the step-down transformer Step-up Transformer A step-up transformer is one where the e.m.f. in the secondary coil is greater than the e.m.f. in the primary coil. It is used to increases the potential difference. The number of windings in the secondary winding is … Read more


[This image is original released under GNU Free Documentation license ] What is the transformer? A transformer is a device that is used to raise or lower down the potential difference of an alternating current. Function: The function of a transformer is to increase or decrease the potential difference of an alternating current supply. Structure … Read more

Root Mean Square Voltage/Current

The Effective Voltage for a Sinusoidal Alternating Current The maximum potential difference supplied by an a.c source is known as the peak voltage VP. The effective potential difference for an a.c is equal to the potential difference of an alternating current if both results in the same heating effect. The effective potential difference for a.c … Read more

Alternating Current Generator

A 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 the external circuit. The armature is initially at the vertical position. No magnetic flux is cut and hence no induced current … Read more

Direct Current Generator

The figure above shows the illustration of a simple direct current (d.c.) generator. You should notice that the simple d.c generator is almost the same as the d.c. motor except that the battery in the d.c. motor is removed and replaced by a resistor. The direct current generator produces electric current (or voltage) base on … Read more

Law of Electromagnetic Induction

There are 2 principal laws of electromagnetic induction: Faraday’s law Lenz’s law Faraday’s Law The magnitude of the induced e.m.f is determined by Faraday’s Law. Faraday’s Law states that the magnitude of the induced e.m.f is directly proportional to the rate of change of magnetic flux through a coil or alternatively the rate of the … Read more