taking too much current or voltage during start up any electronic device

[neeraj786]

When ever we turn on any electronics device it takes too much voltage or current.. after that it leaves it. why???

 

[abhi_tandon80]

Electronic device if uses SMPS contain capacitors to act as tank for fluctuating voltage ,which act as short circuit during initial power up ,but insted of that now circuits contains MOV,ressatable fuses etc.which comes to normally functioning after attaining certain temperature,this temperature is achieved through power supply current

 

[neeraj786]

what do want to say ???? Exactly ??? i didn't get too much ??

 

[abhi_tandon80]

tell me the device reference than i can explain you better

 

[neeraj786]

tell me the device reference than i can explain you better

" refrigerator and computer (desktop)"

 

[abhi_tandon80]

Refrigerator had a compressor -----> inside a motor you know well at start up motor requires high current once it achive normal rpm current drops for computer monitor contains CRT which act as a very big capacitor it requires initally very high current (Property of capacitor) and Switched mode power supply common to both .In SMPS the first circuit contains big capacitor which again require large inital current

if you see in broad way inductive device(motor) and capacitor when ever comes in picture you can see this phenomenon but it can't be seen in resistive load ,Check simple bulb it will not show you this

 

[IanP]

When ever we turn on any electronics device it takes too much voltage or current.. after that it leaves it. why???

You can call this effect – inrush current.
In all electronic devices you can find bigger or smaller storage capacitors that, as the name indicates, have to be charged first and that occurs when the power is switched on.
Once caps are charged the device’s current consumption drops to its average value.
:wink:
IanP