What is the SI unit for electrical current?

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Build your vocabulary for the IGCSE Coordinated Science Exam. Study with flashcards and multiple choice questions, each with hints and explanations. Prepare for success!

Multiple Choice

What is the SI unit for electrical current?

Explanation:
Current is the rate at which electric charge flows past a point. The SI unit for this flow rate is the ampere (symbol A). By definition, one ampere means one coulomb of charge passing a point every second. This makes ampere the natural unit for measuring how much charge moves each second. The other options refer to different quantities: coulomb is a unit of charge (the total amount of charge), and volt is a unit of potential difference (how much energy per unit charge is available). A common misspelling is amphere, but the correct spelling is ampere. For example, if 4 coulombs pass a point in 2 seconds, the current is 2 amperes.

Current is the rate at which electric charge flows past a point. The SI unit for this flow rate is the ampere (symbol A). By definition, one ampere means one coulomb of charge passing a point every second. This makes ampere the natural unit for measuring how much charge moves each second. The other options refer to different quantities: coulomb is a unit of charge (the total amount of charge), and volt is a unit of potential difference (how much energy per unit charge is available). A common misspelling is amphere, but the correct spelling is ampere. For example, if 4 coulombs pass a point in 2 seconds, the current is 2 amperes.

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