Question

two resistors of values 4 and 8 ohms are connected in series with a unknown resistance r and a 12v battery. find the unknown resistance if current through the circuit id 0.5A

Answer 1

Answer:

r=12 ohms

Explanation:

Net resistance = V/I = 12/0.5 = 24 ohms

Net resistance = 4+8+r = 24 ohms

12 + r = 24

therefore, r = 12 ohms

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