How wireless charger works

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Inductive charging / wireless charging or cordless charging uses an electromagnetic field to transfer energy between two objects through electromagnetic induction. This is usually done with a charging station. Energy is sent through an inductive coupling to an electrical device, which can then use that energy to charge batteries or run the device. Induction chargers use an induction coil to create an alternating electromagnetic field from within a charging base, and a second induction coil in the portable device takes power from the electromagnetic field and converts it back into electric current to charge the battery. The two induction coils in proximity combine to form an electrical transformer.
Greater distances between sender and receiver coils can be achieved when the inductive charging system uses resonant inductive coupling. Recent improvements to this resonant system include using a movable transmission coil and the use of other materials for the receiver coil made of silver plated copper or sometimes aluminium to minimize weight and decrease resistance due to the skin effect.

Source - Wikipedia

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Join Samsung Health Community
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Samsung Foldable Phones Price and Launch Revealed
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To know new display style in Samsung phones click the link

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Problems after UPDATES

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Read to know battery issues

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To know more about One U.I. click the link
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Make Samsung community health.

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Make Samsung community health.

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[Raviijangra]

Steps to Measure Blood oxygen Level (Spo2)  
 1. Open the S Health app on your device . (If it's not pre-installed on your phone, get it from Samsung Apps or Google Play Store) 
2. If this is first time opening the S Health app, you need to do some initial setup. 
3. Tap the More button on the top right corner of the screen, and then touch the Manage Items option
 4. There you should see available health tracker options, including the Heart rate, SpO2, Stress, Blood glucose and Blood pressure. 
 5. Make sure to toggle ON the SpO2 item and then go back to the S Health main view
 6. Scroll down to the list of already added items, and then find the SpO2 card and tap the Measure button 
7. Now place finger on the sensor, which is located at the back of your Device, wait for the measurement to start and complete. 
 8. Keep being still and quiet, until you get the result.
 9. You can save your measured blood exygen (SpO2 level) and track it over the time

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Your device can flash the rear camera light when you receive any notifications or when alarms sound by activating Flash notification alert. 
 
Navigate to Apps → Settings → Accessibility → Hearing → Enable Flash Notification