Automotive Electronics Practice Test

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Study for the Automotive Electronics Test. Prepare with engaging flashcards and detailed multiple-choice questions. Each question comes with hints and explanations. Ace your exam with ease!

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What is the formula to find the current if the resistance and voltage are known?

I = E x R
E = I / R
I = E / R
R = E / I

The correct answer is: I = E / R

The correct formula to find the current when the resistance and voltage are known is I = E / R. In this formula, I represents the current measured in amperes (A), E stands for voltage measured in volts (V), and R denotes resistance measured in ohms (Ω). This relationship is derived from Ohm's Law, which states that current is directly proportional to voltage and inversely proportional to resistance. When voltage is known, along with the resistance in the circuit, dividing the voltage by the resistance gives the current flowing through the circuit. Understanding this formula is essential in automotive electronics, where diagnosing electrical issues often involves measuring voltage across components and knowing their resistance in order to determine the actual current flowing through the system. Thus, being able to apply I = E / R enables technicians to accurately troubleshoot and analyze electrical problems in vehicles.