NEIEP Mechanics Practice Exam

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Prepare for the NEIEP Mechanics Exam with multiple choice questions, hints, and detailed explanations. Ace your test and advance your career!

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At full charge, what is the voltage across a capacitor?

  1. 50% of the source voltage

  2. 75% of the source voltage

  3. 100% of the source voltage

  4. 25% of the source voltage

The correct answer is: 100% of the source voltage

The voltage across a capacitor at full charge will equal the source voltage. When a capacitor is connected to a voltage source, it begins to charge until the voltage across its plates matches the voltage of the source. This is described by the fundamental principles of capacitance, where the voltage across a capacitor can be represented by the equation \( V = Q/C \), with \( V \) being the voltage, \( Q \) the charge, and \( C \) the capacitance. As the capacitor charges, it accumulates charge until it can no longer take in more, effectively reaching a steady state at which point the voltage is equal to the voltage of the source. Hence, at full charge, the voltage across the capacitor will be 100% of the source voltage.

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