The effective resistance between the points A and B in the figure is
Correct answer: A. 2 Ohms
- A. 2 Ohms
- B. 6 Ohms
- C. 3 Ohms
- D. 4 Ohms
Explanation
Resistor AD and DC are in series For series combination: Re=R1+R2 =AD+DC =3ohm+3ohm =6ohm, this is in parallel combination with resistor AC For parallel combination: Re=R1R2/R1+R2 =6X6/6+6 =3ohm. In the 2nd figure resistor AC and CB are in series, so we add them, Re=3+3 =6ohm, now this resistor is in parallel combination with the last resistor of value 3ohm Re=6x3/6+3 =2ohm, here is the answer.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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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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