Voltage Drop in a AC to DC Adapter??

Question

Imagine that I have an AC to DC (220V AC to 18.5V DC) Adapter for an electronic appliance and if the AC side is connected to the power socket and if the DC side of the adapter is not connected to the appliance will there be a significant voltage drop across the transformer & resistors of the Rectifier Circuit?? If I have the habit of doing this daily will it reflect in my Electricity Bill??

Thanks in Advance.

Answer 1

There will be some voltage drop due to leakage currents and voltage drops across semiconductor junctions; the exact amount depends on the design, but it will be much less than with the load connected.

However, the power used will be very small, since that depends on the voltage AND the current, and without a load, the current will be very small (just leakage and eddy-current losses in the transformer). There will be some small electricity usage, but it is recommended that these adapters not be left plugged in, since even the small dissipation can cause heating of the transformer core.

Answer 2

If itt is a transformer, there will be a current flow in the primary coil and if the secondary is open circuited (ie not used) there will be some loss as heat. There will be no voltage drops in the secondary circuit because there is no current flowing. (Voltage drop and power dissipation are two different things).

The heat generated will always be a safe amount if the pack has been designed properly and installed properly. The amount of electricity consumed is negligible (daily) but annually it will add up. Also, as the heat gets worse, if the heat does not dissipate properly, the transformer properties will deteriorate, which leads to a loss of lifetime.

In a switched mode converter, usually an open circuit on the secondary will be detected and power consumption will be minimal (with modern circuitry).

Answer 3

Definitely there will be a small power loss and heat dissipation in the device which will reduce the life of adapter. It is advisable to plug off the adapter if not in use

Answer 4

a working laptop or laptop workstation, or easily laptop (additionally pc workstation, pc and notepad) is a small cellular workstation, which often weighs 2-18 pounds (around a million to eight kilograms), in step with length, components, and distinctive factors. Laptops many times run on a unmarried substantial battery or from an exterior AC/DC adapter that rates the battery on the comparable time additionally offering energy to the workstation itself. Many desktops actually have a three volt telephone to run the clock and distinctive approaches in the form of a ability failure. Laptops comprise factors which could be corresponding to their workstation opposite numbers and carry out the comparable applications, although are miniaturized and optimized for cellular use and useful energy intake, although often much less solid for the equivalent cost. Laptops greater often than no longer have liquid crystal shows and maximum of them use particular memory modules for their random get entry to memory (RAM), case in point, SO-DIMM in lieu of the greater useful DIMMs. apart from to a outfitted-in keyboard, they're going to make the main of a touchpad (additionally generic as a trackpad) or a pointing stick for enter, nonetheless an exterior keyboard or mouse can in all probability be linked. a workstation workstation is an impartial private laptop (workstation), as against smaller varieties of desktops, corresponding to a cellular laptop. forward of the vast unfold of desktops a workstation that could desire to adventure on a table replaced into acknowledged remarkably small. right this moment the word extremely in many cases shows a desirable style of laptop case. workstation desktops are available in a style of varieties ranging from super vertical tower situations to small style ingredient fashions which could be tucked at the back of an liquid crystal demonstrate demonstrate. in this adventure, the term 'workstation' refers noticeably to a horizontally-orientated case, maximum many times meant to have the visual demonstrate unit placed on top to circumvent dropping living house on the table proper. maximum reducing-side laptop desktops have separate reflects and keyboards.