Impedance and current in an LR circuit from R, L and frequency

1. A.
   $\frac{4}{7}$ A
2. B.
   1.0 A
3. C.
   $\frac{4}{\sqrt{7}}$ A
4. D.
   0.8 A

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1. A.
   $\sqrt{R^{2} + 2\pi{fL}^{2}}$
2. B.
   $\sqrt{R^{2} + L^{2}}$
3. C.
   $R + 2\pi fL$
4. D.
   $\sqrt{R^{2} + 4\pi^{2}f^{2}{\text{ }L}^{2}}$

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1. A.
   $12.5\Omega,9.2\text{ }A$
2. B.
   $46.4\Omega,6.4\text{ }A$
3. C.
   $23.2\Omega,5\text{ }A$
4. D.
   $50\Omega,4.6\text{ }A$

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1. A.
   $1.6$ A
2. B.
   $1$ A
3. C.
   $0.2$ A
4. D.
   $0.4$ A

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1. A.
   $0.5$
2. B.
   $1$
3. C.
   $1.5$
4. D.
   $2$

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