Which of the following devices is associated with alternating currents only?
A
Step-up transformer
B
Induction coil
C
Moving coil galvanometer
D
Lead-acid accumulator
Verified Correct Answer: A.
Physical Principles & Numerical Solution
The device associated with alternating currents (AC) only from the provided options is the step-up transformer. Step-up transformers are specifically designed to work with alternating currents and are used to increase voltage levels in AC systems.
Source: Myschool Past Questions Archive (Record #69430)