A resistor with an electrical resistance of 4 ohms is connected to a direct current source with an EMF of 12 V

univerkov | February 6, 2021 | education

A resistor with an electrical resistance of 4 ohms is connected to a direct current source with an EMF of 12 V and an internal resistance of 2 ohms. What is the current in the circuit?

EMF = 12 V. r = 2 Ohm. R = 4 ohms. I -? Let’s write Ohm’s law for a closed circuit: I = EMF / (r + R). I = 12V / (2 Ohm + 4 Ohm) = 2 A.
Answer: the current in the circuit is I = 2 A.

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