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Lesson: The Moving-Coil Galvanometer Physics

In this lesson, we will learn how to describe the application of the motor effect to the measuring of electric current by a moving-coil galvanometer.

Lesson Plan

Students will be able to

describe the arrangement and functions of the components of a moving-coil galvanometer,
describe the deflection of a moving-coil galvanometer in response to an applied current,
calculate the sensitivity of a moving-coil galvanometer.

Lesson Presentation

Lesson Video

Lesson Explainer

Lesson Worksheet

Q1:

The arm of a moving-coil galvanometer is deflected through an angle of when the current through the galvanometer is 180 μA. What is the sensitivity of the galvanometer? Answer to two decimal places.

Q2:

The diagram shows a cross-section of a moving-coil galvanometer. Which of the following diagrams most correctly represents the magnetic field around the galvanometer core?

Q3:

The diagram shows a moving-coil galvanometer. The terminals of the galvanometer are connected to a direct-current source. Which of the terminals A or B connects to the positive output of the source?