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AC Voltage Applied to a Resistor - 1 Video Lecture | Physics for JAMB
FAQs on AC Voltage Applied to a Resistor - 1 Video Lecture - Physics for JAMB
| 1. What is AC voltage? |  |
Ans. AC voltage, or alternating current voltage, refers to the type of electrical voltage that constantly changes in both magnitude and direction over time. It is typically represented by a sine wave and is commonly used in household electrical systems.
| 2. What is a resistor? | |
Ans. A resistor is an electrical component that is designed to resist the flow of electric current. It is often used to control the amount of current in a circuit or to reduce the voltage level. Resistors are typically made of materials with high resistance, such as carbon or metal alloys.
| 3. How does AC voltage affect a resistor? | |
Ans. When AC voltage is applied to a resistor, the resistor experiences a constantly changing voltage and current. The magnitude and direction of the voltage and current vary with time, following the pattern of the AC waveform. The resistor will dissipate energy in the form of heat, proportional to the square of the current flowing through it, according to Ohm's Law.
| 4. What happens to the resistance of a resistor when AC voltage is increased? | |
Ans. The resistance of a resistor remains constant regardless of the voltage applied. The resistance value is determined by the physical properties of the resistor material and its dimensions. Increasing the AC voltage applied to a resistor will result in a higher current flowing through the resistor, according to Ohm's Law, but the resistance itself does not change.
| 5. Can a resistor handle any level of AC voltage? | |
Ans. Resistor specifications usually indicate a maximum voltage rating that the resistor can handle. Exceeding this voltage rating may cause the resistor to overheat or even fail. It is important to select a resistor with a voltage rating suitable for the application to ensure safe and reliable operation.
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