Why can some electric appliances be immersed in water without damage?

a. the thermostat and the timer are in a sealed compartment below the pan

b. the heating element is sealed and the control is in the detachable probe

c. the heavy aluminum shell protects the thermostat

d. they use a ribbon heating element on a mica sheet

The heating element is sealed and the control is in the detachable probe.

Explanation:

The electrical system of those appliances has been sealed (or properly insulated) so that when immersed in water, no water can get to the electrical components. This is reduces drastically the quantity of water that flow into the electrical parts.

Note that during the construction of these type of appliances, the probability of being immersed in water has been taken into consideration. Thus, they can be immersed in water without damage.

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.