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What does the ideal diode model assume?

  • A.Zero forward drop and infinite reverse resistance
  • B.A constant forward drop of about seven tenths of a volt
  • C.A forward resistance that varies with the applied current
  • D.A reverse leakage that doubles for every ten degrees of rise

Answer: A

The ideal model treats the diode as a perfect switch: no drop when conducting and no current when blocking, which is enough for deciding whether a diode conducts in a given circuit. The constant drop is the next model up, the piecewise-linear one. A current-dependent resistance belongs to the exponential law, and temperature-dependent leakage is a real effect outside all three models. Choosing the simplest model that answers the question is the whole skill in diode analysis, and the ideal model answers more questions than its crudeness suggests.

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