Lesson: Alternating-Current Ammeters

Physics

In this lesson, we will learn how to describe the construction of ammeters using the thermal expansion of conducting wires to measure alternating currents.

Worksheet

Q1:

Which of the following would help reduce developing zero errors in a hot-wire ammeter?

Q2:

Which of the following diagrams most correctly shows the divisions of the scale of a hot-wire ammeter corresponding to equal changes in current?

Q3:

A hot-wire ammeter is calibrated by using it to measure a direct current source that is also measured by a direct-current ammeter. Which of the following most correctly explains why the divisions on the scale of a hot-wire ammeter would not be spaced equivalently to the divisions on the scale of a direct-current ammeter that had the same resistance?

Preview