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The phrase "an internal power source" is correct and usable in written English.
You can use it when referring to a power supply that is contained within a device or system, as opposed to an external power source.
Example: "The new model features an internal power source that enhances its portability and efficiency."
Alternatives: "a built-in power supply" or "an onboard power source."
Exact(3)
The design does neither require an internal power source nor an auxiliary signal path for power delivery at startup.
Many RFID systems use the so-called passive or semi-passive tags that do not use an internal power source to communicate with the RFID reader.
Active RFID tags or beacons, on the other hand, have an internal power source which is used to power any ICs and generate the outgoing signal (Ni et al. 2004; Jin and Lu 2006).
Similar(57)
They have no internal power source, but use the electromagnetic field transmitted by a reader to power their internal circuits.
Level designer Dario Casali describes it as a 'sticky bomb that you fire at a Strider's underbelly that will draw power from the Strider's internal power source.' In-game, the device will stick so long as it contacts the Strider's body, and will instantly destroy it when fired upon with any other of the player's weapons.
But because these extinguished stars have no internal power source, they don't shine brightly.
Believing the Blue Fairy to be real, David asks to be turned into a real boy, repeating his wish without end, until the ocean freezes in another ice age and his internal power source drains away.
Internal power sources are batteries whereas the external power sources include inductive radio-frequency (RF) coupling.
It's an internal power struggle.
Analysts believe an internal power struggle may be under way.
A hybrid energy system used in robotic tractors for precision weed and pest control in agriculture is evaluated and its exhaust emissions compared with the use of an internal combustion engine as a single power source.
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