27. Resistors & DC Circuits

Resistors and Ohm's Law

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?
Multiple Choice
In the context of resistors and Ohm's law, which symbol and SI unit are used to represent electrical resistance?
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Multiple Choice
Two resistors are made of the same material, one twice as long as the other. If the current through the shorter resistor is 5 A, what is the current through the longer resistor if they both have the same potential difference and cross-sectional area?
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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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Multiple Choice
In a cylindrical resistor, what is the effect on the resistance if the radius of the vessel is halved, assuming the length and material remain constant? (The resistance $R$ of a cylinder is given by $R = ρ \frac{l}{π r^{2}}$ , where $ρ$ is resistivity, $l$ is length, and $r$ is radius.)
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Multiple Choice
Which of the following best describes Ohm's Law?
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Multiple Choice
In a circuit, a resistor has resistance $R$ and the current through it is $I$ . According to Ohm’s law, how do you calculate the voltage drop across the resistor?
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Multiple Choice
Which of the following is the SI unit for electrical resistance?
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Multiple Choice
In a simple electric circuit, which component is specifically designed to provide resistance and oppose the flow of current?
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Multiple Choice
If a resistor has the color bands green, blue, brown, and gold, what is its resistance and tolerance?
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Multiple Choice
A resistor has a current through it of 5 A. If the EMF across the resistor is 10 V, what is the resistance of this resistor?
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Multiple Choice
A certain wire has length L and radius r, and a resistance of R. That wire is melted down and the same volume of the same metal is used to produce a wire with length 2L. What is the resistance of the resulting wire?
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