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# Electronics Engineering

## Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.

### Why in short circuit test iron loss is very less?

In short circuit test very low voltage at primary approx 5 % of the rated voltage is given and secondary is short circuited by an ammeter. Due to low voltage very low flux is developed in core of the transformer and due to that iron losses are very low which can be neglected. By Rizwan: actually it is operated at (10-15)% of the rated voltage and as you know n case of low voltage low magnetic flux is produced and then there will...

### Which way should you set your ceiling fan to turn - in the summer and in the winter?

These recommendations depend on the height and size of the room, the season, and the activity taking place in the room. Keep in mind that warm air rises to the top and cold air settles on the bottom. Air settles in layers from warm at the top to cold at the bottom, if left alone at equilibrium. Ceiling fan recommendations: In the winter Set the fan to run counterclockwise (reverse; this looks clockwise as you are looking up). This will redirect the warm...

### Is there any application of Lenz law in DC motor?

yes lenz law states that every current opposes the reason which cause the generation of that current . it is very useful for considering back emf in dc motor. The lenz law also help us to determine the supply voltage of DC motor. ...

### What is Ohm's law?

Ohm's Law states: "The current flowing through a conductor is directly proportional to the applied voltage, provided the temperature of the conductor remains constant." It specifically refers to conductors and not resistors. And it takes into consideration the need to maintain a given temperature as the voltage and current vary. At the time, Georg Ohm already knew that allowing the temperature to vary would break the constant ratio. Keep in mind that this was a historic new understanding that he had discovered was applicable...

### What is dynamic resistance of diode?

The Current-Voltage relationship of a diode is not constant (not a straight line) and hence the resistance cannot be measured. Due to this non-linear nature of the the curve, there exists a unique value of resistance at every point of the curve which is called dynamic resistance (not static of constant resistance). The dynamic resistance equals the change in voltage divided by the change in current, when the voltage is changed by a small amount. In other words it is the slope...

### How to calculate power in an inductive load?

Inductive load power is reactive, it is given by the formula: pL(t)=VL(t)IL(t), in time domain (instant power); PL(s)=VL,RMS(s)IL,RMS(s), in Laplace transform domain (RMS denotes root mean square amplitude). VL is the voltage across the inductor L and IL is its current (current enters in the "+" voltage reference pin, by applying user convention in which absorbed power is positive). Power is reactive since voltage and current are always in quadrature: VL(s) = s L IL(s), in Laplace domain (derived from the time-domain formula vL(t)= L diL(t)/dt). A real-life inductor will...

### What instrument measures electrical current?

The instrument used to measure electrical current is called an ammeter, which is actually a shortened form of 'amp meter'. The current is measured in amperes. In scientific labs, a much more sensitive instrument called a galvanometer is used to measure very small currents. ...

### Why hissing noise occur in transformer?

A: Hissing is because is overheating before it destroy itself. But other noises are caused by loose lamination of the core. B: Hissing noise is produced due to this reason but here is another important point is about frequency (e.g for 50 Hz) the core lamination face attractive and repulsive forces fifty times in one cycle because frequency is 50 Hz. Another Answer The original answer is unnecessarily melodramatic. Transformers are fitted with protective devices that will disconnect the transformer long before a rise in...

### How many volts is 50 kv?

50 Kv = 50,000 volts

### Who invented the cell phone and when?

Martin Cooper invented the cell (mobile) phone. He was the first one to make a call and speak on his moble phone. Mr Cooper, born December 26, 1928, wanted people to be able to carry their phones with them anywhere. While he was a project manager at Motorola in 1973, Cooper set up a base station in New York with the first working prototype of a cellular telephone, the Motorola Dyna-Tac. After some initial testing in Washington for the F.C.C., Mr. Cooper...
###### Asked in Electronics Engineering, Internet

Advantages: more easy to generate. easy way of communication. Disadvantages: very difficult to transmit as it is. devices used are expensive. lots and lots of noise interruptions. accuracy is less. transmission and reception is not very easy. ...

### What are the uses of logic gates?

Logic gates are in fact the building block of digital electronics; they are formed by the combination of transistors (either BJT or MOSFET) to realize some digital operations (like logical OR, AND, INVERT ). Every digital product, like computers, mobile, calculators even digital watches, contain logic gates. The use of logic gates in digital world can be understood better by the following example: the single bit full adder in digital electronics is a logic circuit which perform the logical addition of two...

### What is the difference between motors and generators?

A motor converts electrical energy into mechanical energy and a generator converts mechanical energy into electrical energy. Longer answer The primary difference between a motor and a generator is that one converts electrical energy into mechanical energy (that's the motor) and the other converts mechanical energy into electrical energy (that's the generator). In some cases of direct current (DC) machines, but not alternating current (AC) machines, there is so little difference that a single device (it might be called a motor-generator) can be used as...

### What is the Need for Doping in Semi conductors?

Doping is done to increase the conductivity of semiconductors

### How many ohm's is a 1M5 resistor?

The plural of 'ohm' is ohms, not ohm's. The alpha-numeric code for identifying the resistance of a resistor is quite straightforward. The letter is used as a multiplier. For example, k = x1000 and M = x1000 000. In other words, k represents kilo, and M represents mega. The position of the letter represents the position of the decimal marker. So, 1M5 represents 1.5 x 1000 000, or 1.5 megohms. 15M represents 15 x 1000 000, or 15 megohms. etc. Similarly, 1k5 represents 1.5 x 1000, or 1.5...

### Is electrical power measured in coulombs?

No. Coulombs are a measure of charge - literally electrons, although the whole unit is much larger than a single electron. In some circuits, such as lithium ion battery chargers, literally measure the amount of current over time which gives you the amount of charge - coulombs - that has passed from the battery into the powered device or vice versa. All that being said, in this case, the value of the coulombs can be negative. This simply represents a charge imbalance. Power is...

### How do I test a capacitor when I cannot remove it out of circuit?

You cannot. It must be taken out of the circuit and then tested on its own. That's not 100% true because, if it has wires at its ends, you can cut through one wire with an appropriate tool and then test the capacitor "out of circuit". If the capacitor is ok you can then re-join the two cut wire ends by applying a blob of solder carefully. (But, to avoid damaging the capacitor, use a suitable heat sink to shield the body...

### Working principle of phase control?

A: it must apply to AC since there is no phase in DC. Since AC is a complete circle 0-360 degrees the principle if to conduct current at a degree of the circle. And AC has both positive 0 to 180 and negative 180 to 360 polarity it is possible to control output power by conducting current only at certain angle of the circle . The phase angle is to differentiate the conducting current in which quadrant of the circle ...

### Can you use ac ammeter to measure dc current?

It depends. If it's an inductive ammeter (the kind that clamps around a wire), it won't work at all. If it is the type of ammeter that is actually placed in the circuit, it will work but it won't be accurate. Comment Actually, modern 'clamp on' ammeters WILL measure d.c. currents. It uses the Hall Effect to measure the current. ...

### How many watts in computer's 230 volts?

It depends on the current being drawn by the computer's components. The voltage will remain constant at 230V and should have a maximum amperage rating labeled on the power supply. Multiply the volts times the max amp rating to find out the max wattage that the power supply can handle. The watts actually being used is probably lower than the rated max (and should be). ...

### How do you reduce 9V DC to 3V DC?

Use either DC to Dc converter or voltage regulators for the required voltages. Answer A common method is to use a voltage divider circuit. This comprises a number of resistors, connected in series, across the power supply. This creates a series of voltage drops across each resistor and, by choosing resistors of appropriate value, the desired load voltage can be achieved. For example, if three identical resistors are connected in series across 9 V, then the voltage across each resistor will be 3 V, and...

### What are time order signals?

They are words that show time or order in a phrase, for example: then, after that, at noon, next, after dinner, and so on. ...

### Truth table for 3 input AND gate?

input output 000 0 001 0 010 0 011 0 100 0 101 0 110 0 111 1 Just to generalize, No high output till all inputs are high. ...