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AC Voltage Applied to a Resistor - 2 Video Lecture | Physics for JAMB

FAQs on AC Voltage Applied to a Resistor - 2 Video Lecture - Physics for JAMB

1. What is AC voltage?

Ans. AC voltage stands for alternating current voltage. It is a type of electrical voltage that periodically changes direction, alternating between positive and negative cycles. This is in contrast to DC voltage, which flows in only one direction.

2. What happens when AC voltage is applied to a resistor?

Ans. When AC voltage is applied to a resistor, the resistor experiences an alternating current flow. The current passing through the resistor changes direction periodically, causing the resistor to heat up and dissipate power. The amount of power dissipated by the resistor can be calculated using Ohm's Law (P = V^2/R), where V is the voltage and R is the resistance.

3. How does the frequency of AC voltage affect a resistor?

Ans. The frequency of AC voltage refers to the number of cycles per second at which the voltage alternates its direction. When the frequency of AC voltage increases, the rate at which the current alternates also increases. This results in a higher number of current cycles passing through the resistor in a given time, causing the resistor to heat up more quickly. Hence, higher frequency AC voltage can lead to increased power dissipation in the resistor.

4. Can a resistor limit the flow of AC voltage?

Ans. Yes, a resistor can limit the flow of AC voltage. The resistance value of the resistor determines the amount of current that can flow through it. The higher the resistance, the more it restricts the flow of current. Therefore, by choosing an appropriate resistance value, a resistor can effectively limit the flow of AC voltage in a circuit.

5. Does the AC voltage applied to a resistor have any impact on its resistance?

Ans. No, the AC voltage applied to a resistor does not have any direct impact on its resistance. The resistance value of a resistor remains constant regardless of the voltage applied. However, the power dissipated by the resistor, which is determined by the voltage and resistance, will vary with the applied AC voltage. Therefore, the voltage affects the power dissipation in the resistor, but not its resistance.

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May 20, 2025 Last updated

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