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Chapter 4: Q12DQ (page 841)

Which of the graphs in Fig. Q25.12 best illustrates the current I in a real resistor as a function of the potential difference V across it? Explain.

Short Answer

Expert verified

Graph (a)best illustrates the current I in a real resistor as a function of the potential difference V across it.

Because as per Ohm’s law the graph of current vs potential should be a straight line.

Step by step solution

01

Ohm’s law

The resistance, or the ratio of voltage to current, for all or part of an electric circuit at a fixed temperature, is generally constant.

Ohm's law may be expressed mathematically as

VI=R

02

Understand the equation and match with the graph

Ohm’s law in an equation form is

VI=RI=VR

Therefore, the slope of the equation is1R.

So, the graph will be in a straight line.

Therefore graph (a)best illustrates the current I in a real resistor as a function of the potential difference V across it because as per Ohm’s law the graph of current vs. potential should be a straight line.

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