A RULE of series currents is current flows Equally! through all components
Heres a table for ex. how the breakdown of the voltage useing ohms law[I(current)=E(voltage)/R(resistance)]
Also would show how to find current if unknown by dividing the total voltage(9)/total res 18k(18,000) =.0005A=500ua
R1. R2. R3. Total
__________________________________
E|___1.5___|___5___|__2.5___|____9___|
I |_500ua_|_500ua_|_500ua_|_500ua _|
R|__3kΩ___|_10kΩ_|__5kΩ___|_18kΩ __|