What is the unit for measuring electric current?

Prepare for the Pre-IB Grade 9 Science Exam with detailed flashcards and multiple-choice questions. Each question is paired with hints and thorough explanations. Ace your test with confidence!

Multiple Choice

What is the unit for measuring electric current?

Explanation:
Electric current is the rate at which electric charges flow through a conductor. The unit used to measure that rate is the ampere, abbreviated A. One ampere means one coulomb of charge passes a given point every second. This unit name honors Andre-Marie Ampere. In circuits, voltage is the push that drives the current and is measured in volts (V), while resistance is what slows the flow and is measured in ohms (Ω). Power is the rate of energy use and is measured in watts (W). A handy relation is I = V / R, which shows how current depends on voltage and resistance, but the unit for current remains amperes. For example, 1 volt across 1 ohm yields 1 ampere of current.

Electric current is the rate at which electric charges flow through a conductor. The unit used to measure that rate is the ampere, abbreviated A. One ampere means one coulomb of charge passes a given point every second. This unit name honors Andre-Marie Ampere. In circuits, voltage is the push that drives the current and is measured in volts (V), while resistance is what slows the flow and is measured in ohms (Ω). Power is the rate of energy use and is measured in watts (W). A handy relation is I = V / R, which shows how current depends on voltage and resistance, but the unit for current remains amperes. For example, 1 volt across 1 ohm yields 1 ampere of current.

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