Answer:
It depends on the circuit. Many would answer with Ohm's law, but that is not accurate because Ohm's law is applicable only to a particular case:
Ohm's law I = U / R; where R is a constant linear resistance, U a voltage, I a current, and no other impedance is in the system.
Ohm's law allway applies to linear constant resistances, but there is much more to an electrical system than just plain resistances.
Besides linear constant resistances there are: inductances, couppled inductances, capacitances, non linear behaviour, voltage and current sources, radiation behaviour, etc.. They all play a role t
Step-by-step explanation:
Calculating electrical current in D C circuit : I (Intensity of current) =E (electromotive force) / R (Resistance of circuit).(ohm’s law)
Calculating electrical current in A C circuit : Ohm’s law for Capacitive circuit : The current in a capacitive circuit is directly proportional to applied voltage and inversely proportional to the capacitive reactance. I = E/Xc.
If there is a resistance in series with the capacitor,then I = E/Z , Z is the total impedance of, To find Z , square root of R square + Xc square.
Calculating electrical current in A C circuit,: Ohm’s law for Inductive circuit :
I = E/ XL ; 0r square root of R square + XL square =Z impedance. I + E/Z .