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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.
24,372 Questions
What are the factors that affect the resistance of a conductor?
The factors that affect the resistance of a conductor are the material it is made of, the length of the conductor, the cross-sectional area of the conductor, and the temperature of the conductor. Materials with high resistivity, longer lengths, smaller cross-sectional areas, and higher temperatures will have higher resistance.
AN RF Isolator is really a three port device called an "RF Circulator" in which one port is always terminated correctly with a suitable load. RF Isolator are usually passive and are bandwidth limited.
Typical use: It used in the output of a RF Transmitters High Power Amplifiers but before a BP/ HP filter and the antenna.
Typical Function: To isolate a TX RF Power Amplifier output from receiving RF feedback from external sources. i.e. In this case the RF coupled in from other Antenna systems in close proximity. Such undesired RF feedback would cause intermodulation / harmonics products to be generated within the RF amplifier and consequently be re-radiated out along the the desired RF signal to the antenna and possibly cause interference. Often used on all TX's in two way radios sites to avoid local IM.
SIMPLIFIED: In other words an Isolator passes RF in one direction but attenuates RF in the other direction.
Note: The RF Isolator is slightly non linear and therefore it can cause low levels of intermodulation / harmonics. So it is good practice to place either a basic Band Pass or High pass filter after the RF Isolator to attenuate the unwanted IM products.
Tuning these RF Circulators / Isolators correctly requires a suitable network analyzer or combination of RF Bridge / Spectrum Analyzer with Tracking generator.
Which is the best center to do your final year project related to ECE?
Phoenix Aero Technologies is a good project center in coimbatore. Aerospace, Mechanical and electronics projects as well as gate coaching is provided.
For more details visit: www.phoenixaerotech.com
or mail us at: dinesh@phoenixaerotech.com
Operations research.
What is current controlled current sources?
A unidirectional current controller device is a type of electrical on/off switch. In order for an item to work that is plugged into a particular outlet, the switch must be in the on position. It is like having lamps plugged into outlets that are controlled by only one switch.
What is the current through the 150 ohm resistor?
It depends on the voltage applied across it. But the maximum current is limited by the power-rating of the resistor (power divided by the square of the voltage).
Could The waveform across resistors have been predicted by kirchhoff's voltage law?
This Law does not talk about wave form
Continuous circuits are electrical circuits that provide a continuous path for current to flow without interruption. They consist of interconnected components such as resistors, capacitors, and power sources, allowing for the steady movement of electric charge. In a continuous circuit, the flow of electricity is maintained as long as the circuit is closed and the power source is active. This contrasts with open circuits, where the flow of current is disrupted.
What is the total resistance three resistors one 10k one20k one30k?
it depends on the way the 3 resistors are connected and across which two terminals you would like to measure...
if all 3 connected in series the simple...60k....if parrell then (1/10+1/20+1/30)^-1 k
What Cable is used for feeders and branch circuits?
For feeders and branch circuits, the most commonly used cable is the NM (Non-Metallic) cable, often referred to as Romex. This type of cable typically consists of two or more insulated conductors and a bare ground wire, all enclosed in a plastic sheath. In commercial applications, THHN/THWN wires within conduit are often used for feeders and branch circuits as well. The selection depends on factors such as the installation environment, voltage, and current requirements.
Any metal with a good conductivity can be used; normally thin copper or mild steel that is tin plated is used the later is less expensive.
Voltage can be calculated using Ohm's Law:
Voltage = Current (A) x Resistance (Ω)
Voltage = 4A x 3Ω = 12 Volts
Therefore, the battery is a 12 Volts.
The power dissipated is Voltage x Current
Power = 4A x 12V = 48 Watts
What is Impulse response of R-L circuit?
impulse response is exponential increasing with respect to time.
What are the two classifications of inputs?
- Digital (numeric)
- Analog (voltage or current)
- Discrete (individual switch/relay closures)
- Analog (frequency or phase)
- Serial
- Analog (polyphase syncro or servo)
- etc. application specific classifications of input
What is the difference between rated current In and tripped current?
"Rated current" is the current the device (motor or transformer?) is designed to handle at full load. "Tripping current" is the current where a protective device (fuse, breaker) will open to protect the device from overload/overheating. "Tripped current", may be the current the tripping device measured prior to making the decision to trip, if you are reading this from a digital protective device like a relay or OCR.
v = i*R
If i goes down then R must go up (assuming v remains the same).
Anwer
Completely impractical question. Resistance is not directly affected by voltage or current, so what you describe won't happen!
What is Solkar Current Differential?
A transmission system is employed with pilot relaying schemes for protection. Pilot is a channel which transmits the information from one end of the transmission line to the other.The information is normally an electrical quantity that is measured at both the ends. The different pilots used are wire pilot, carrier-current pilot and microwave pilot.
Solkar system ( reyrolle) is a scheme employing the wire pilot. It is commonly called the balanced voltage or opposed voltage scheme. It operates on the principle of current differential protection.
Further details in Protection and Switch gears by Badri Ram and Viswakarma.
