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.
What is EPM? Enhanced Protected Mode (EPM) adds additional security to Protected Mode and includes AppContainer and 64-bit tabs. Internet Explorer in the new Windows UI runs in AppContainer, but AppContainer is also an available option on Internet Explorer for the desktop. AppContainer prevents pages from reading or writing to the rest of the operating system.