ASVAB Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

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

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.

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Let-through Current

Resistor

Voltage Source

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