1. Field of the Invention
In the field of electrical appliances that are used around water, there is an inherent problem of submitting the user to the risk of electrocution or serious shock or even death. Thus, there is a need to avoid the risk of dangerous shocks or even death if the appliance falls into a tub of water in which someone is bathing or if someone reaches or steps into water containing a plugged-in appliance regardless of whether the switch thereof is on or off. In particular, for example, in view of the fact that the great majority of hair dryers today stay in the bathroom, these appliances pose a serious risk hazard.
2. Description of the Prior Art
There is a device called a "ground-fault circuit interruptor (GFCI)" which, by law in some states, must be installed in bathrooms of all new homes. But this protects the user from electrocution only when the electric appliance he is using is leaking electricity or is short-circuited. It does not protect the user without fail in such conditions as described above.