Hey there!
Let's define our variables:
E- Voltage
I- Current
R- Resistance
A method that you can use to find Voltage, Resistance, and Current is a bit confusing, but looks like this:
V
I R
If you want resistance, you cover the R, and you get V/I. If you want Voltage, you cover the V and get IR. It's a very helpful tool.
Hope this helps!