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V = IR

V = IR

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter23: Resistive-inductive-capacitive Series Circuits
Section: Chapter Questions
Problem 1RQ: What is the phase angle relationship of current and the voltage dropped across a pure resistance?
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In the context of electrical circuits, Ohm's law describes the relationship between the voltage, V , across a resistor, the electrical current, I, passing through the resistor, and a quantity, R, known as the resistance. The law can be written as follows: V = IR Voltage is typically measured in volts, current is measured in amperes (or amps), and resistance is measured in ohms, where 1 ohm = 1 volt/amp. In a circuit with variable resistance, the quantities V, I, and R might all depend on time. Suppose that the voltage across the resistor is held constant at 20 volts, while the resistance is steadily increased at a rate of 0.15 ohms/sec. At what rate is the current changing when the resistance reaches 10 ohms? You may leave off the units (amps/sec). Hint: You may first need to determine the current through the resister at the moment when resistance reaches 10 ohms.
Transcribed Image Text:In the context of electrical circuits, Ohm's law describes the relationship between the voltage, V , across a resistor, the electrical current, I, passing through the resistor, and a quantity, R, known as the resistance. The law can be written as follows: V = IR Voltage is typically measured in volts, current is measured in amperes (or amps), and resistance is measured in ohms, where 1 ohm = 1 volt/amp. In a circuit with variable resistance, the quantities V, I, and R might all depend on time. Suppose that the voltage across the resistor is held constant at 20 volts, while the resistance is steadily increased at a rate of 0.15 ohms/sec. At what rate is the current changing when the resistance reaches 10 ohms? You may leave off the units (amps/sec). Hint: You may first need to determine the current through the resister at the moment when resistance reaches 10 ohms.
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