Power Source and Charging
Modern electric toothbrushes run on low voltage, 12v or less. A few units use a step-down transformer to power the brush, but most use a battery, usually but not always rechargeable and non-replaceable, fitted inside the handle, which is hermetically sealed to prevent water damage. While early NiCad battery toothbrushes used metal tabs to connect with the charging base, modern toothbrushes use contactless inductive charging: the brush unit and charger stand each contain a coil of wire; when placed in proximity, the powered coil from the stand transfers power by induction to the handle, charging the battery.
Read more about this topic: Electric Toothbrush
Famous quotes containing the words power, source and/or charging:
“Rocked in the cradle of the deep
I lay me down in peace to sleep;
Secure I rest upon the wave,
For Thou, O Lord! hast power to save.”
—Emma Hart Willard (1787–1870)
“Because relationships are a primary source of self-esteem for girls and women, daughters need to know they will not lose our love if they speak up for what they want to tell us how they feel about things. . . . Teaching girls to make specific requests, rather than being indirect and agreeable, will help them avoid the pitfalls of having to be manipulative and calculating to get what they want.”
—Jeanne Elium (20th century)
“You must neither add anything to what I command you nor take away anything from it, but keep the commandments of the LORD your God with which I am charging you.”
—Bible: Hebrew, Deuteronomy 4:2.