In many places 24 V AC has been popular as a power source but now 12 V and 24 V DC is increasing in popularity because
A) There is more energy in DC.
B) It is easier to back-up DC with battery.
C) There is less power loss in cables with DC.
D) There is less risk for surge with DC.

Question

Quizplus · Accepted Answer

DC power systems can be easily backed up with batteries, which store and supply DC power directly, making them more convenient for applications requiring backup power.

In Many Places 24 V AC Has Been Popular as a Power