ASVAB Practice Test

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Prepare for your ASVAB Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Practice this question and more.

In order to make an electric current flow, what is necessary to have?

Ammeter
Let-through Current
Resistor
Voltage Source

The correct answer is: Ammeter

A resistor is an electrical component that resists the flow of current, limiting the amount of electricity that can pass through it. A voltage source provides the potential difference necessary for current to flow. While both a resistor and voltage source are necessary for current flow, they are not the only requirements. A let-through current is a measure of the current that passes through an electrical device during a short circuit, and it is not necessary for current flow. An ammeter, on the other hand, is a device used to measure the flow of electric current in a circuit and is therefore necessary for current flow. It can't be assumed that the current is flowing just because there is a voltage source and resistor present, so an ammeter is needed to confirm the current flow.