If a capacitor is connected to an AC source, how does the current behave?

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Question: If a capacitor is connected to an AC source, how does the current behave?

Options:

Correct Answer: It leads the voltage

Solution:

In an AC circuit, the current through a capacitor leads the voltage by 90 degrees.

If a capacitor is connected to an AC source, how does the current behave?

If a capacitor is connected to an AC source, how does the current behave?

Correct Answer: Current leads voltage by 90 degrees.

Step 1: Understand what a capacitor is. A capacitor is a device that stores electrical energy in an electric field.
Step 2: Know what AC (Alternating Current) means. AC is a type of electrical current that changes direction periodically.
Step 3: When a capacitor is connected to an AC source, the voltage across the capacitor changes over time.
Step 4: The current flowing through the capacitor does not change at the same time as the voltage. Instead, it changes earlier.
Step 5: This means that the current reaches its maximum value before the voltage does. This is called 'leading'.
Step 6: In terms of angles, we say that the current leads the voltage by 90 degrees in an AC circuit with a capacitor.

Capacitive Reactance – In an AC circuit, capacitors oppose changes in voltage, causing the current to lead the voltage by 90 degrees.
Phase Relationship – Understanding the phase difference between current and voltage in capacitive circuits is crucial for analyzing AC behavior.