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The relationship between Voltage, Current and Resistance in any DC electrical circuit was discovered by the German physicist Georg ohm. According to ohm's law, at a constant temperature, the current is directly proportional to the voltage and inversely proportional to the total resistance of the circuit.
I = V / R t
I = Current
V = Voltage
Rt = Total Resistance
By using Ohm's Law
I = V / R
I = 12 V / 10 Ω
I = 1.2 A
Clearly, current in the circuit is 1.2 Ampere.
Alternatively, voltage or resistance of the circuit can be find out by knowning other two values.
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