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Homework Statement
There is a current of 0.25 A in the circuit of the figure
What is the value of the resistance R?
Homework Equations
V = IR
The Attempt at a Solution
since the circuit is in series:
V = 6+ 12 = 18V
Req = R + 6 + 12
V = IReq
Req = 18/0.25 = 72
72 = 18+ R
R = 54
but the answer is wrong !
help