Question

13.) which of these is the electronic device that allows current to flow only in one direction?

la. transistor

a diode

c. capacitor

d. resistor

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Explanation:

A diode is a semiconductor device that has two terminals, anode and cathode. It allows current to flow in one direction (from anode to cathode when forward - biased) and blocks current in the reverse direction.
A transistor is a device used for amplification or switching of electronic signals.
A capacitor stores electrical energy in an electric field.
A resistor resists the flow of electric current but does not have a one - way current - flow property like a diode.

Answer:

B. Diode