Re: Which uses less power

VanguardLH, 2024-10-23 15:26:

Arno Welzel <usenet@arnowelzel.de> wrote:
 

sms, 2024-10-22 22:05:
>

On 10/21/2024 11:15 PM, Bill Powell wrote:

Which uses less of the phone's battery power on long trips?
>
Playing long podcasts with the Android speaker as the output?
Playing long podcasts with a Bluetooth speaker as the output instead?
>
Any idea?

>
Speaker wattage is about 3W.

>
So it draws around 1 ampere when running at around 3 volts? Really?
>
Maybe the theoretical output wattage is 3 watts, but a smartphons
speaker will also just draw a few 100 mA which will be around 0.3 to 1 watts
>

Bluetooth uses about 2.5mW.

>
No. Depending on how actually use Bluetooth, the power requirements can
be much higher:
>
<https://novelbits.io/ble-power-consumption-optimization/>

 
That article addresses power consumption at the BLE device, not at the
smartphone powering its BT radio.  In the phone, not in the BT devices,

[...]

This article was just an example to illustrate some real world numbers.

Even with BLE it can happen, that a device can draw an *average* power
of more than 18 mW and not just 2.5 mW. And "device" is also the
Smartphone of course.

And when BLE is already using 18 mW in some situations, regular
Bluetooth does not need *less* power than this - the reason for BLE was
to *save* power - thus the name "Bluetooth Low Energy".


--
Arno Welzel
https://arnowelzel.de