Answer: a semiconductor diode.
- A a metal wire at constant temperature
- B a semiconductor diode
- C a carbon film resistor
- D a length of nichrome wire
Correct answer: B. a semiconductor diode
Explanation: A semiconductor diode conducts very differently in forward and reverse bias, so its V-I graph is non-linear and direction-dependent, a limitation of Ohm's law.
In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.
Concept context
Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.