DC Voltage Drop Calculation Across Inductance  

Where,
V  Voltage drop across inductor
L  Inductance in henry
di/dt  instantaneous rate of change of current with respect to time
Example:
Calculate the voltage across inductor for the given details and apply the Ohms law formula for an inductor.
Inductance (L) = 5
Rate of change of current = 15
Time = 20
Solution:
Apply for formula:
Ohm's Law for an Inductor: V = L (di/dt)
V = 5(15/20)
V = 5*0.75
V = 3.75
Voltage across Inductor = 3.75