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I am not sure if its the right place to ask but the question is related to electronics so I assume I can ask here .

The charger(power supply) output rating is 180 watts (9Ax20V) and 15 watts(5Vx3A) , which is mentioned on the power adapter.

Can it charge at a wattage inbetween like 140 watts? For example if a device supports 140 watts maximum will it chargee at 15 watts or 140 watts because apprently 180 watts is not supported.

Bhavishya Yadav
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  • I dont think its duplicate question ? – Bhavishya Yadav Mar 26 '24 at 15:43
  • it's not a battery charger, it is a power supply ... the battety charger is built into the device that contains the battery – jsotola Mar 26 '24 at 16:10
  • There seems to be an usual misconception/confusion between ability to supply and consume. The PS can provide 180W, but the device will consume anything from 0-to-140W, there is no contradiction. – Ale..chenski Mar 26 '24 at 17:38
  • How does that exactly work ? Where does the extra current go ? – Bhavishya Yadav Mar 26 '24 at 17:50
  • What is the significance of the and 15 watts part of the question? Does the power adapter produce more than one voltage supply? – Chester Gillon Mar 26 '24 at 17:50
  • Yes 15 watts (5Vx3A) has different voltage and current – Bhavishya Yadav Mar 26 '24 at 17:51
  • And that reflects my assumption . I thought the power supply will only provide 180 watts only when a 180 watts capable device is connected . And will simply switch to 15 watts if the upper limit of device is less than 180 watts . – Bhavishya Yadav Mar 26 '24 at 17:59
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    Thought experiment: when I switch on a 10 W light bulb connected to the Irish 5000 MW national grid what will happen to the extra 4,999,999,990 W? Answer: nothing. The lamp will draw 10 W. – Transistor Mar 26 '24 at 18:23
  • If both your power supply and the connected device (load) support PD (Power Delivery) or a similar protocol, they should negotiate a suitable voltage and current. Since we don't know anything about your power supply or the load, your question isn't answerable. – StarCat Mar 26 '24 at 19:01
  • @BhavishyaYadav this topic is not about circuit design – Voltage Spike Mar 26 '24 at 20:54
  • @Transistor well you cant directly use it you will need a transformer or the bulb will fuse . And The power adapter has a small transformer which can supply 20 volts from 240 volts mains supply . My question was can a power adapter provide voltage and current other than the mentioned output on the adapter . – Bhavishya Yadav Mar 27 '24 at 08:33
  • Regarding the bulb, it won't fuse because there's a transformer down the road from my house. Another though experiment: I have a 95 W power supply on my laptop. What will happen when I put the laptop to sleep with the power supply still connected? – Transistor Mar 27 '24 at 09:07
  • @BhavishyaYadav This question is off topic https://electronics.stackexchange.com/help/on-topic – Voltage Spike Mar 27 '24 at 15:14
  • @StarCat My question is can a power adapter provide voltage and current other than the mentioned output on the adapter . If this is answerable . It is a regular mobile charger . – Bhavishya Yadav Mar 27 '24 at 16:16
  • @Transistor Charge the device and then power supply turns off ? Maybe you are referring to charge overnight function in mobiles ? – Bhavishya Yadav Mar 27 '24 at 16:18
  • No, the power supply doesn't turn off. It stays on. The power supply is generally a constant voltage output. The current will depend entirely on what the load draws. If the load is switched off no current is drawn while the voltage remains constant. V x 0 = 0 W. The power supply is not constant power output* it is constant voltage output, variable current (the same as the supply to my house). – Transistor Mar 27 '24 at 21:41

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