Question

If the total voltage applied in a series circuit of three resistors is 120 V and the voltage drop across R1 is 20 V and R2 drops 30 V, what is the voltage drop for R3?

Answer 1

total voltage =120 v
voltage across R1=20 V
voltage across R2=30 V
so then for R3, voltage drop will be =total volatge-(voltage drop for R1+ voltage drop for R2)=120-(20+30)=70 V