Which of the following devices is associated with alternating currents only?
-
Step-up transformer
- Induction coil
- Moving coil galvanometer
- Lead-acid accumulator
The correct answer is: A
Explanation
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.