Connect 4 ohms to a current source with an EMF of 12 V and an internal resistance of 2 ohms.

Connect 4 ohms to a current source with an EMF of 12 V and an internal resistance of 2 ohms. Determine the current strength.

Given:

U = 12 Volts – EMF of the current source;

r = 2 Ohm is the internal resistance of the current source;

R = 4 Ohm – resistance, which was connected to the current source.

It is required to determine I (Ampere) – current strength.

To determine the current strength, you must use the following formula (Ohm’s law):

U = I * (R + r), hence:

I = U / (R + r) = 12 / (2 + 4) = 12/6 = 2 Amperes.

Answer: the current strength will be equal to 2 Amperes.