27. Resistors & DC Circuits

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 ($I=\frac{V}{R}$)?

Which one of the following statements concerning resistors in series is true?

A circuit has a voltage of $12V$ across a resistor and a current of $2A$ flowing through it. According to Ohm's Law, what is the value of the resistor $r$?

Which formula represents Ohm's Law?

Which equation correctly relates the current to the voltage in a simple circuit according to Ohm's Law?

Which of the following is the Ohm’s law formula for finding current?

In Ohm's Law, the variable letter $I$ stands for what physical quantity, and is measured in which unit?

According to Ohm's Law, which of the following correctly relates the voltage $V$, current $I$, and resistance $R$ in a resistor?

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?

If two resistors with resistances $R_1$ and $R_2$ are connected in series, what is the effective resistance $r$ of the system?

Which of the following equations represents Ohm's Law?

Which of the following is not an application of Ohm's Law?

Conductor resistance causes a(n) $V_{\mathrm{drop}}$ between the voltage source and the connected load. Which term best completes the sentence?

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?

According to Ohm's Law, how many ohms of resistance will allow a current of $1A$ to flow when a voltage of $1V$ is applied across a resistor?