The graphical representation of Ohms law is___________________?
Correct answer: D. straight line
- A. hyperbola
- B. ellipse
- C. parabola
- D. straight line
Explanation
Ohm's law is V = IR, so for constant resistance a graph of potential difference V in volts (V) against current I in amperes (A) is a straight line through the origin, with slope R in ohms (Ω). Option a is a common mistake because a hyperbola results when voltage and current are inversely related, not when their ratio is constant.
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About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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