Basic Automotive Electrical Diagnostics 2025 – 400 Free Practice Questions to Pass the Exam

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What is the role of Ohm's law in automotive diagnostics?

It measures voltage only

It defines resistance only

It links voltage, current, and resistance in a circuit

Ohm's law plays a crucial role in automotive diagnostics by establishing the relationship between voltage, current, and resistance in an electrical circuit. By expressing this relationship with the formula V = I × R, where V represents voltage, I represents current, and R represents resistance, technicians can analyze various electrical issues that may arise in vehicles.

For instance, if a technician measures the resistance of a component and knows the applied voltage, they can use Ohm's law to calculate expected current. This is instrumental in diagnosing issues like short circuits or open circuits—conditions where current flow is disrupted due to resistance anomalies. By understanding how these three elements interact, professionals can effectively troubleshoot electrical systems, ensure proper functioning, and repair components with greater accuracy. This foundational understanding is vital in a field that heavily relies on electrical and electronic systems for vehicle operation.

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It specifies power consumption only

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