Here is a handy reference chart that shows the relationship between electrical current (I) in Amps, resistance (R) in Ohms, voltage (E) in Volts and power (P) in Watts.  These relationships are known as Ohm's Law, named after the German Physicist and Mathematician Georg Simon Ohm who discovered these relationships:

---

Here is another variation of the Ohm's Law chart that may prove helpful: