AC is when the electrons flow in two directions, from the positive to the negative terminal and from the negative to the positive terminal, 'alternating' between the two directions. A lot of people think of electron flow as electrons moving along a wire freely like cars go down a highway.
To check the status of protected mode, choose File > Properties > Advanced > Protected Mode. Protected mode is enabled by default. To specify the settings, do the following: Choose Edit > Preferences. In the Categories list on the left, select Security (Enhanced). In the Sandbox Protections section, select or deselect Enable Protected Mode At Startup. Enable Create Protected Mode Log File to record events. The changes take effect the next time you start the application.
Add-ons that are incompatible with Enhanced Protected Mode are not loaded when Enhanced Protected Mode is enabled. If you have an incompatible add-on installed, you can choose to disable Enhanced Protected Mode for the desktop browser. To do this, you can follow the steps in the Workaround section. However, because Enhanced Protected Mode provides protection from malware, you may want to first contact your add-on vendor to see whether a compatible version of the add-on is available.