What are the standard units for resistance and electric current?

Study for the IGCSE Physics Electricity Test. Master key concepts with flashcards and multiple choice questions, each providing hints and explanations. Prepare with confidence for your exam!

Multiple Choice

What are the standard units for resistance and electric current?

Explanation:
The standard units are ohms for resistance and amperes for current. Resistance tells us how much a component resists the flow of electric charge, and its unit is the ohm (Ω), defined as one volt per ampere (Ω = V/A). Electric current is the rate at which charge flows, measured in amperes (A), defined as one coulomb of charge passing a point every second. These units fit together in Ohm’s law, V = IR, so voltage (volts), current (amperes), and resistance (ohms) relate consistently. The alternatives mix up the units—current isn’t measured in volts, resistance isn’t measured in watts, and voltage isn’t measured in ohms.

The standard units are ohms for resistance and amperes for current. Resistance tells us how much a component resists the flow of electric charge, and its unit is the ohm (Ω), defined as one volt per ampere (Ω = V/A). Electric current is the rate at which charge flows, measured in amperes (A), defined as one coulomb of charge passing a point every second. These units fit together in Ohm’s law, V = IR, so voltage (volts), current (amperes), and resistance (ohms) relate consistently. The alternatives mix up the units—current isn’t measured in volts, resistance isn’t measured in watts, and voltage isn’t measured in ohms.

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