ASVAB Practice Test

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Prepare for the ASVAB exam with quizzes designed to improve your skills. Use flashcards and multiple choice questions, each providing hints and explanations. Get ready to succeed!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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.