Raman Tripathi Dec-12-2018 05:39:16 AM ( 5 months ago )
What is something electrical engineers know that others don't?
Lucky Negi Dec-12-2018 05:43:46 AM ( 5 months ago )
- The processor in your computer has a billion transistors switching on and off over a billion times per second to bring you Quora today. But you knew that.
- You need special static discharge protection to handle this processor, because the slightest shock from your finger can destroy it. But you knew that too.
- What you probably don’t know is how that shock does the deed. Every transistor has an incredibly tiny capacitor (the gate), and the charge separator between the poles is around 10 atoms thick. It’s made of one of the most powerful dielectrics known to man, but 10 atoms can only resist a few volts of potential. Most processors now receive an input around 5 volts then down regulate it as low as 1.7 volts.
- That arc you saw on the door knob this morning was well over 1000 volts.
- You can discharge tens or hundreds of volts of static to a conductor without even knowing it. You may not even feel it zap.
- When you touch the lead of a processor without grounding, those hundreds of volts hit the transistors and their puny 10 atom gates like a Mack truck hitting a paper wall.
- Imagine a series of rubber diaphragms designed to work with 5 PSI being hit with a blast of 1000 PSI. It will rip through them as if they’re not even there as the pressure desperately searches for a way out.
- But that gate thickness is THE critical variable for processor performance. Every switch of a transistor uses power, which makes heat. The thinner gate lets us cut the voltage, which reduces the heat proportionally.
- Heat is a funny thing in a processor. As a semiconductor heats up, the resistance of a transistor decreases. That’s because the energy in the lattice manifests as electrons jumping to the conduction band and becoming available as charge carriers.
- Low resistance should be a good thing right? Sure, when the transistor is on. We EEs have that covered already. But when it’s off you want infinite resistance. As electrons become available the transistor begins allowing leak current to pass, and that leak current generates heat.
Yasmin Mirza Dec-12-2018 05:46:08 AM ( 5 months ago )
- Batteries are not like fuel tanks: a fully discharged battery is clinically dead.
- Standing in front of the microwave oven’s door is a bad idea.
- Microwaves pollute the WiFi Channel 6
- All your phone conversations have been between you and a robot software that mimics the other person’s voice. The other phone may fall to the toilet and you’ll continue listening sound for up to 1–2 seconds.
- MP3 compress data in a number of ways, for example removing all music right after a loud bass sound, because the ear is temporarily deaf after a loud low frequency but the brain ignores the gap of silence.
Garry Buttler Dec-12-2018 05:52:12 AM ( 5 months ago )
The current in the tester pass through the human body and to the ground; thus completing the circuit and the LED glows.
This necessitates that for successful checking of an electrical socket, the operator keeps his finger at the metallic tip of tester.
2. True that, we don’t know to repair household appliances but that is not we took engineering for.
Electrical engineering more of deals with economic aspects of engineering viz.
- Economic generation of power.
- Economic load dispatch.
- Power factor improvement and thus saving cost of energy bills.
- Optimization of design of electrical machines for material saving and high efficiency.
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