27. Resistors & DC Circuits

Resistors and Ohm's Law

Multiple Choice
In the context of resistors and Ohm's law, a unit of electric resistance is called a(n):
Multiple Choice
According to Ohm's law, the current $I$ through a resistor equals what expression in terms of voltage $V$ and resistance $R$ ?
Multiple Choice
In basic circuit measurements related to resistors and Ohm’s law, which instrument is used to measure electrical resistance?
Multiple Choice
In a DC circuit, what can an excessive voltage drop measured across a component most likely indicate?
Multiple Choice
Which of the following is NOT an application of Ohm's law?
Multiple Choice
In a DC circuit, which component opposes current flow?
Multiple Choice
Ohm's law describes the relationship between which physical quantities in an electrical circuit (for an ohmic resistor)?
Multiple Choice
Conductor resistance causes a(n) $V_{drop}$ between the voltage source and the connected load. Which term best completes the sentence?
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Multiple Choice
In a simple circuit with a fixed applied voltage $V$ , how does increasing the resistance $R$ affect the electric current $I$ according to Ohm’s law?
Multiple Choice
In the context of resistors and Ohm's law, what SI unit is used to measure electrical resistance?
Textbook Question
You've decided to protect your house by placing a 5.0-m-tall iron lightning rod next to the house. The top is sharpened to a point and the bottom is in good contact with the ground. From your research, you've learned that lightning bolts can carry up to 50 kA of current and last up to 50 μs. You don't want the potential difference between the top and bottom of the lightning rod to exceed 100 V. What minimum diameter must the rod have?
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Multiple Choice
In the context of resistors and Ohm's law, which symbol and SI unit are used to represent electrical resistance?
Multiple Choice
According to Ohm's Law, how many ohms of resistance will allow a current of $1 A$ to flow when a voltage of $1 V$ is applied across a resistor?
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Multiple Choice
Which of the following is one function of a resistor in a circuit?
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Multiple Choice
According to Ohm's Law, what is the relationship between the current and the voltage across a resistor in a circuit?
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