The following formula gives the resistance of a circuit:
a. R = I / E [resistance equals current divided by voltage]
b.
c. R = E / R [resistance equals voltage divided by resistance]
d. R = E / I [resistance equals voltage divided by current]
Your answer "b" is not correct. "d" is the right answer.
E = I x R
I = E / R
R = E / I
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