Ontario Grade 9 Science Class Practice Exam

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What does an ammeter measure?

Electric current.
The mass of an atom.
The distance between the sun and orbiting objects.
Protons in an atom's nucleus.

The correct answer is: Electric current.

An ammeter is a device used to measure the electric current flowing through a circuit. Therefore, options B, C, and D are incorrect because they do not pertain to the purpose of an ammeter. Option B discusses the measurement of atomic mass, which is completely unrelated to electric current. Option C talks about measuring the distance between the sun and orbiting objects, which is a task for devices such as telescopes and satellites. Option D mentions measuring the number of protons in an atom's nucleus, which is typically done using a special type of spectroscope. Thus, the correct answer is A, as an ammeter specifically measures electric current.