A resistor is connected to a 12v battery. What is its resistance if the current is 30mA?

univerkov | July 14, 2021 | education

We translate the values from given to the SI system:
I = 30 mA = 30 * 10 ^ -3 A.
According to Ohm’s law for a section of the circuit:
I = U / R.
Let us express from this expression, resistance:
R = U / I.
Substitute the numerical values:
R = U / I = 12 / (30 * 10 ^ -3) = 400 ohms.
Answer: the resistance of the resistor is 400 ohms.

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