27. Resistors & DC Circuits

Resistors and Ohm's Law

Multiple Choice
Which of the following circuits correctly demonstrates Ohm's Law, where the current through a resistor is directly proportional to the voltage across it and inversely proportional to its resistance ( $I = \frac{V}{R}$ )?
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Multiple Choice
Which one of the following statements concerning resistors in series is true?
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Multiple Choice
A circuit has a voltage of $12 V$ across a resistor and a current of $2 A$ flowing through it. According to Ohm's Law, what is the value of the resistor $r$ ?
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Multiple Choice
In the context of resistors and Ohm's law, what SI unit is used to measure electrical resistance?
Multiple Choice
Which formula represents Ohm's Law?
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Multiple Choice
Which equation correctly relates the current to the voltage in a simple circuit according to Ohm's Law?
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Multiple Choice
In the context of resistors and Ohm's law, which component provides resistance in an electric circuit?
Multiple Choice
Which of the following is the Ohm’s law formula for finding current?
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Multiple Choice
In the context of resistors and Ohm's law, which SI unit is used to measure electrical resistance?
Multiple Choice
In the context of resistors and Ohm's law, what is the SI unit of electrical resistance?
Multiple Choice
In Ohm's Law, the variable letter $I$ stands for what physical quantity, and is measured in which unit?
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Multiple Choice
According to Ohm's Law, which of the following correctly relates the voltage $V$ , current $I$ , and resistance $R$ in a resistor?
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Multiple Choice
In a circuit, a measured voltage drop across a switch (with the switch intended to be closed) most directly indicates that the switch is behaving as what kind of circuit element?
Multiple Choice
Four resistors with resistances $R_{1}$ , $R_{2}$ , $R_{3}$ , and $R_{4}$ are connected in series to a battery with voltage $V$ . What is the total current flowing through the circuit?
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Multiple Choice
In a DC circuit, a resistor has resistance $R$ and the current through it is $I$ . According to Ohm's law, what is the voltage drop across the resistor?