by Sunday | Oct 8 | NABTEB QUESTIONS
If conduction in material results only from the electron movement from valence to conduction band, it is called an intrinsic semiconductor. While semiconductor materials containing different types of impurities are combine to produce the many useful devices presently...
by Sunday | Oct 8 | NABTEB QUESTIONS
The specific heat capacity of a solid in the form of a metal block can be determined by an electrical method and method of mixture. (1) By Electrical Method Two holes are bored in as the block, after which the block is weighed. A thermometer and an electrical heater...
by Sunday | Oct 8 | NABTEB QUESTIONS
The molecules of the liquid have an average velocity or average kinetic energy which increases with temperature. Molecules near the surface which happen to move faster than the average, escape from the attraction of their neighours and out of the liquid. Thus the...
by Sunday | Oct 8 | NABTEB QUESTIONS
Molecules of solid are in fixed position in the crystalline structure. They are held together by intermolecular forces. This constraint makes them to vibrate about their mean equilibrium position. Aluminum is a solid. As the temperature of the solid Aluminium...
by Sunday | Oct 7 | NABTEB QUESTIONS
Two forms of energy loss in a transformer are: 1. eddy current 2. heat loss (1²R) / Joules heat or copper loses. 3. Magnetic flux leakage. 4. Hysteresis These energy losses can be reduced by 1. Eddy current can be reduced by laminating the core 2. Heat loss can be...
by Sunday | Oct 7 | NABTEB QUESTIONS
Two electrical devices whose operation is based on the laws of electromagnetic induction are: i. the transformer ii. the generator iii. the induction coil
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