Stove top coil surface heating element, 8 inch. If the element does not heat either it or the control switch is defective. The coil can be tested to determine if it is at fault.
Range/stove surface element (6-inch). If the surface element won't heat, either the surface element or the surface element switch may be defective. To determine if the surface element is defective, use a multimeter to test it for continuity.
Heating element assembly with thermostat