What is the total current is V is 10 Volts R1 is 500 Ohms and R2 is 1500 ohms?

We need to find R equivalent at first then divide V from it to find the total current.

Case 1: If resistances are connected in series.

Then, R(eq.) = R1 + R2 = 500 + 1500 = 2000 ohm

So, Total current, I = V/R(eq.) = 10/2000 = 1/200 or 0.002 A.

Case 2: If resistances are connected in parallel.

Then, R(eq.) = (R1 x R2)/(R1 + R2) = (500 x 1500)/(500 + 1500) = 400 ohm

So, Total current, I = V/R(eq.) = 10/400 = 1/40 or 0.025 A.