Multiple Choice
Ohm's law describes the relationship between which physical quantities in an electrical circuit (for an ohmic resistor)?
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27. Resistors & DC Circuits
Resistors and Ohm's Law
Multiple Choice
Which of the following is NOT an application of Ohm's law?
A
Computing the equivalent resistance of two resistors in parallel using
B
Determining the voltage drop across a resistor using when current and resistance are known
C
Finding resistance from measurements using for an ohmic device
D
Calculating current using for a resistor with known voltage and resistance
Verified step by step guidance1
Recall that Ohm's law states the relationship between voltage (V), current (I), and resistance (R) as \(V = I \times R\). This law applies to ohmic devices where resistance remains constant.
Identify which options directly use Ohm's law formulas: calculating voltage drop (\(V = I \times R\)), finding resistance (\(R = \frac{V}{I}\)), and calculating current (\(I = \frac{V}{R}\)) all come directly from Ohm's law.
Understand that computing the equivalent resistance of two resistors in parallel uses the formula \(\frac{1}{R_e} = \frac{1}{R_1} + \frac{1}{R_2}\), which is derived from circuit analysis principles, not directly from Ohm's law.
Recognize that while Ohm's law relates voltage, current, and resistance for a single resistor, the formula for equivalent resistance in parallel is a separate concept involving how resistors combine in circuits.
Conclude that the application NOT based on Ohm's law is the calculation of equivalent resistance for resistors in parallel, as it involves combining resistances rather than applying the \(V = IR\) relationship.
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