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.
The company advises Internet Explorer users that the Enhanced Protected Mode, on by default in IE 10 and IE 11, used with EMET, will help protect against this potential risk.. The company did not address what people who use IE 9 or older should do. It's not expected that IE 6 will ever see an update, as Microsoft has stopped issuing security updates for the 12-year-old browser that still makes up 4.65 percent of the browser market.