1. A kilowatt hour is the unit of (i) energy(ii) power(iii) electric charge(iv) electric current 2. Heat produced in a conductor depends (i) inversely on time(ii) directly on time(iii) both (i) and (ii)(iv) none of the above 3. If potential difference across a conductot of a material of resistivity ρ remains constant, then heat produced […]
Slip rings are often overlooked aspects of machines that have a rotary part to it and need a transmission of electrical signal or power. Without slip rings, rotational devices and machines might not operate as smoothly as they do today, and that’s why slip rings can be seen in so many devices across so many
What are Slip Rings and How do They Tie All Industries Together Read More »
1. The diameter of an atom is about (i) 10-10 m (ii) 10-8m (iii) 10-2 m (iv) 10-15 m 2. The number of compounds available in nature is (i) 105 (ii) 300 (iii) 1000 (iv) unlimited 3. The mass of a proton is …….. the mass of electron. (i) equal to (ii) less than (iii)
Most insulations fail during one of the following events: Switching overvoltage due to the inductive and capacitive energy of the system overshooting the system voltage that can be as high as 2 × rated voltage. This is analogous to overpressure due to water hammer when a water pipe is suddenly shut off (switched-off). Lightning overvoltage
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The fuse provides protection by melting away a thin metal link in the faulted circuit. The metal link may be of silver, copper, or nickel, silver being more common for long-term performance stability. The fuse body is generally filled with a sand-type filler (Figure 1) to suppress sparks when the fuse link melts and interrupts the
When a high reverse-biased voltage applied to a diode may create a high reverse current, which can generate excessive heat and cause a diode to break down. The applied reverse voltage at which the breakdown occurs is called the breakdown voltage, or peak reverse voltage. A special diode called a zener diode is connected to
Thevenin’s theorem is very useful in solving electrical networks which may not be easily solved by other methods. In this article, I will discuss this theorem and show some of the thevenin theorem examples to make this theorem easily understandable. Thévenin’s theorem is a circuit analysis technique that reduces any linear bilateral network to an equivalent
The Kirchhoff’s Laws are very useful in solving electrical networks which may not be easily solved by Ohm’s Law. In this article, I will describe the Kirchhoff’s current law and will show some kirchhoff’s current law examples to make this law easily understandable. Kirchhoff’s current law states the following: The summation of currents entering a node
Hi friends, In this article, I am going to discuss the MHD generator working principle. Also I will provide you some basic information about it. A Magneto Hydrodynamic Generator is a device which converts heat energy of a fuel directly into electrical energy without a conventional electric generator. This system eliminates all the
The current transformers are always used with the secondary windings circuit closed through ammeters, current coils of watt-meters or relay coils. Its secondary winding circuit should not be opened while its primary winding is energized. A violation of this precaution may lead to serious consequences. Here, I am discussing the reasons behind it. As we