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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
How you get power to TV using AAA battery?
Yes, but you might need a lot of AAA batteries, because they don't have a lot of available power.
Why does your digital multimeter read ac and dc on same terminal?
The switching of the circuitry is done internally for the different voltages. This is done when you move the switch on the front of the meter from AC to DC.
What are the available transistor-transistor logic subfamilies?
§ Low-power TTL (L), which traded switching speed (33ns) for a reduction in power consumption (1 mW) (now essentially replaced by CMOS logic)
§ High-speed TTL (H), with faster switching than standard TTL (6ns) but significantly higher power dissipation (22 mW)
§ Schottky TTL (S), introduced in 1969, which used Schottky diode clamps at gate inputs to prevent charge storage and improve switching time. These gates operated more quickly (3ns) but had higher power dissipation (19 mW)
§ Low-power Schottky TTL (LS)- used the higher resistance values of low-power TTL and the Schottky diodes to provide a good combination of speed (9.5ns) and reduced power consumption (2 mW), and PDP of about 20 pJ. Probably the most common type of TTL, these were used as glue logic in microcomputers, essentially replacing the former H, L, and S sub-families.
§ Fast (F) and Advanced-Schottky (AS) variants of LS from Fairchild and TI, respectively, circa 1985, with "Miller-killer" circuits to speed up the low-to-high transition. These families achieved PDPs of 10 pJ and 4 pJ, respectively, the lowest of all the TTL families.
§ Low-voltage TTL (LVTTL) for 3.3-volt power supplies and memory interfacing.
How much current does a line with a voltage of 20 volts and a resistance of 40 Ohms?
The answer is 20 divided by 40, in amps.
What is the major difference an NPN transistor and a PNP transistor?
The NPN transistor has its conduction curve where the base is more positive than the emitter, while the collector is also more positive than the emitter.
The PNP transistor is exactly opposite, with its conduction curve where the base is less positive than the emitter, while the collector is also less positive than the emitter.
In what stage modulation is done on high power amplitude modulation transmission?
In high power AM transmission, modulation is done at
Explain flywheel effect of a tank circuit?
Fly wheeling or ringing is a process where by circulating current will cause a ringing effect where that is useful is on SCR circuit to reverse power for a shot time enough to reduce holding current therefore shutting the device off
How do you measure amps on a 208V single phase circuit with a clamp on amp meter?
Clamp the meter around the energized conductor that is connected to the load to be measured and read the amperage off of the dial face of the meter.
How do you identify a complex circuit?
The term, 'complex circuit', is misleading, as they are not necessarily (but often are) complicated. A 'complex circuit' is simply a category used to describe any circuit that isn't a 'series', 'parallel', or 'series-parallel' circuit. This usually means that special theorems (e.g. Kirchhoff's, Norton's, Thevenin's, etc.) must be used to solve complex circuits.
Does soldering mean replacing?
No, soldering is a method of joining two pieces of metal by melting a different metal with a lower melting temperature into the joint.
Soldering and braising are similar methods but use different metals with a lower melting temperature. Braising metals melt at higher temperatures than soldering metals.
Soldering and welding are different methods. Welding actually involves melting the two pieces of metal being joined into each other. Welding may or may not also involve melting a "filler metal" into the joint.
What is voltage level for a negative logic system?
could be negative or positive
"negative logic" just means, that the level used by "positive logic" within that logic family for False, is instead used for "True" and vice versa.
Which provides a constant bandwidth for the complete duration of message transfer is a?
message switch
What is the difference between core and cord?
A cord is often the same thing as a cable or a wire, as in power cord - the cable between an electrical appliance and the wall socket.
A core is something that inside, either physically in the center (like an apple core), or central in terms of importance, like the core of the emergency services(firefighters, ambulance etc) is a willingness to help people.
Is Welding set a high voltage or high current load?
The arc utilized for arc welding is low voltage high current discharge. The voltage required for maintaining an arc is less than for striking the arc. Voltage drops & current increases as the arc is developed. The voltage required to strike DC arc is about 50-55 V & for AC is 80-90 V.It is difficult to maintain the arc with voltage less than 14V or more than 40V.
READ ELECTRICAL TECHNOLOGY BY B L THAREJA / AK THAREJA
The induced current is maximum when the axis of the conductor, its velocity, and the magnetic field lines are all mutually perpendicular.
What is the correct formula for fuse rating volts x ohms equals watts volts x amps equals ohms?
The fuse rating is inherently tied to the current flow through the fuse, not necessarily the voltage.
The fuse has a small internal "wire" that has a specific resistance; when enough current flows through it, the power dissipated by this "wire" will melt. This power can be expressed P = I^2 x R.
For isolation purposes, fuses are also specified with a voltage rating. This rating is spec'd based on the distance between the (internal) terminals of the fuse that don't melt. For higher voltages, this distance must be increased to prevent power from "jumping across" the small area where the "wire" has melted (this is called arcing).
So when picking a fuse, you must pick a fuse that is rated for the voltage you are using (or higher - you can use 250 volt fuses on 120 volt equipment), and rated for the current you want to allow to flow (specified in amps).
The equations you list in your question are not inherently tied to fusing, but are power fomulas:
P = watts = voltage * current; ohm's law states V = I / R, so
P = V * I = V^2 / R = I^2 * R
V*R does not equal power.
