The relationship between the strong current with a potential difference in a closed circuit was first investigated by a German physicist named George Siemon Ohm in a concept called Ohm's Law. Ohm's Law states that "At constant temperature, strong current in a closed circuit will be proportional to the potential difference between the ends of the circuit".
| V | I | R = V/I |
| 1,5 volt | 0,15 amper | 10 |
| 3,0 volt | 0,30 amper | 10 |
| 4,5 volt | 0,45 amper | 10 |
V = electric potential difference between the ends of the circuit (volts)
I = strong electric current in the circuit (amperes)
R = total resistance circuit at a constant temperature (Ω)
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