Question Video: Identifying the Unit of Electric Current | Nagwa Question Video: Identifying the Unit of Electric Current | Nagwa

Question Video: Identifying the Unit of Electric Current Science • Third Year of Preparatory School

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Which of the following is the unit of electric current? [A] The meter [B] The ampere [C] The coulomb [D] The watt [E] The second

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Video Transcript

Which of the following is the unit of electric current? (A) The meter, (B) the ampere, (C) the coulomb, (D) the watt, (E) the second.

Units are an important part of every physics problem. Not only do they communicate the exact type of quantity we are working with, but they can also include clues to help solve the problems. If we can identify the type of unit that the answer should have, then we can sometimes determine how to find the answer to the problem.

This question is asking for the unit of electric current. Let’s start by looking at a simple circuit. The simple circuit has a voltage source, with the positive terminal and negative terminal connected by a square wire. When the circuit is connected in this way, electric charge flows through the wire. This flow of electric charge is called a current, usually labeled with the symbol 𝐼.

The unit for electric current is the ampere, named after a scientist that did a lot of work on electricity, André-Marie Ampère. The value of the current in a circuit indicates the amount of charge that flows past a point in the circuit every second. If one coulomb of charge flows past a point every second, then there is one ampere of current in the circuit.

So the correct answer for this question is (B), the ampere.

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