hi,
Do you have a multimeter that can measure low levels of current, say 100mA to 500mA.?
If yes, measure the current into the mobile using the meter.? What is the value.?
E

I am measuring like this way but it show 0 A

 

Hello,

A current measurement is always in series with the load.
A voltage measurement is accross the load.

Look at this experiment:
https://www.allaboutcircuits.com/textbook/experiments/chpt-2/ohms-law/

Bertus

 

hi,
Like this.

 

hi,
Like this.

I measured with multimeter it doesn't stay constant it vary form 0 to 1.4 mA
supply 5V at 1 A

I don't think I can see the measure difference of voltage at sensor

 

hi,
Just because the 5V power supply is rated for 2Amp does not mean the device it is connected to will draw 2Amps.
The mobile fone as Ron says will only draw a few mA's from the PSU when the mobile battery is near to being fully charged.
E
Further info:
Assume the mobile battery is fully discharged, it may draw close to 2Amps for a few minutes while the battery is being recharged.
As the battery charged level lincreases the charging current will slowly fall.[ this what you are now measuring ie: mA's]

 

hi,
Just because the 5V power supply is rated for 2Amp does not mean the device it is connected to will draw 2Amps.
The mobile fone as Ron says will only draw a few mA's from the PSU when the mobile battery is near to being fully charged.
E

Can I connect my laptop in same way as load
if adopter 19V at 3.4 A any guess how much current laptop draw

 

hi,
You can do that BUT.
Make sure the Laptop is powered Off.
Connect the Laptop input as the mobile is now connected.
Make sure the polarity of your connects are correct.

The amount of current drawn will depend upon the what the laptop is doing eg: DVD running higher current etc.
[set the meter to to 2Amp or higher range]

Do NOT disconnect the power supply from the Laptop while it is powered ON and running
In theory, the laptop should not give a problem if you do disconnect, but lets be sure.

E

 

Can I connect my laptop in same way as load
if adopter 19V at 3.4 A any guess how much current laptop draw

What you really need here is decent loads and not guessing and trying things. Got any light bulbs, regular incandescent light bulbs? Also, one more time it's an adapter not an adopter.

Ron

 

Hello,

An other thing that can be used as load could be a motor, like a fan.

Bertus