27. Resistors & DC Circuits

Sketch the resistance as a function of current, for V > 0, for the diode shown in Fig. 40–38.

If three different resistors are connected in series to a battery, which of the following statements is correct about the current through each resistor?

Which of the following is not an expression of Ohm's law?

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?

(II) What is the internal resistance of a 12.0-V car battery whose terminal voltage drops to 8.2 V when the starter motor draws 95 A? What is the resistance of the starter?

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?