What is the voltage drop of a 160 ohms resistor?

Ohm's Law requires you know two of three parameters to calculate the third.

Volts = Amps x Ohms

You need to know current flowing through resistance to calculate voltage drop.

Read more: What_will_be_the_voltage_drop_across_each_of_the_following_resistors_A_160_Ohms_B_100_Ohms_C_82_Ohms_D_120_Ohms.