The above shows a schematic diagram of a wireless phone charging device which uses magnetic coupling. Which of the following statements is correct?
a) Alternating current flows in the coil embedded in the charging plate.
b) The phone is charged by self-induction.
c) Direct current flows in the coil embedded in the phone.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
Alternating current flows in the coil in the charging plate. DC cannot induce a voltage in the secondary coil. Although an alternating voltage is induced in the secondary coil in the phone, but there must be a diode in series to provide a DC charging current to the battery, so a "DC current" flows in the coil in the phone (tricky?)