Question

use the text to compare and contrast ac and dc
in the late 1880s, inventors nikola tesla and thomas edison were competing with each
other. edison had developed direct current (dc), which is current that runs in a single
direction. at that time, direct current was the standard form of electricity in the united
states. tesla, however, had developed alternating current (ac), which reverses direction.
as opposed to dc, which cannot be easily converted to lower or higher voltages, ac can
be converted to different voltages with a transformer. edison didnt want to lose money
on his dc patents, so he spread false information suggesting that ac was dangerous.
over the years, though, ac won out as the method of choice. today, ac—not dc—
provides the majority of our electricity.
was developed by edison
runs in a single direction
can easily be converted to different voltages
provides most electricity today

Explanation:

• For "Was developed by Edison": The text says Edison developed DC, so DC gets the check.
• For "Runs in a single direction": The text states DC runs in a single direction, so DC gets the check.
• For "Can easily be converted to different voltages": The text mentions AC can be converted with a transformer (implying easily), so AC gets the check.
• For "Provides most electricity today": The text says "AC—not DC—provides the majority of our electricity", so AC gets the check.

Answer:

• Was developed by Edison: DC
• Runs in a single direction: DC
• Can easily be converted to different voltages: AC
• Provides most electricity today: AC