Calculate the current in the circuit, if the EMF is 10 V, the external resistance is 4 Ohm, the internal resistance is 1 Ohm.


e = 10 Volts – electromotive force (EMF) in the circuit;

r = 1 Ohm is the internal resistance of the EMF source;

R = 4 Ohm – external resistance of the electrical circuit.

It is required to determine I (Ampere) – the strength of the current in the electrical circuit.

To determine the current in an electrical circuit, you must use the following formula:

e = I * (R + r), from here we find:

I = e / (R + r) = 10 / (1 + 4) = 10/5 = 2 Amperes.

Answer: the strength of the current flowing through the electrical circuit is 2 Amperes.

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