He is learning how to operate the new machine.

We need to measure the strength of this electric current.

Let's try the new function of this machine.

How does this machine function?

This company is very stable.

This machine has a function to even out the current.

What is this device used for?

I measured the current using an ammeter.

This old science book explains the concept of circular current in detail.

This device operates using a circular current.