El valor de la resistencia R que se ha de conectar en serie con el diodo LED, si el diodo soporta una tensión máxima directa de 1.9 V y una corriente máxima de 30 mA. Nota: la pila es de 9 V.

Two students are discussing electricity that has a frequency of 60 hz. student a says that this type of electricity is referred to as ac. student b says that in this type of electricity, the electrons flow in only one direction. which of the following statements is correct? a. only student a is correct b. only student b is correct c. both of the two students are correct d. neither of the two students is correct