Question 166: AC fundamentals

Question

An alternating emf $$\mathrm{E}=440 \sin 100 \pi \mathrm{t}$$ is applied to a circuit containing an inductance of $$\frac{\sqrt{2}}{\pi} \mathrm{H}$$. If an a.c. ammeter is connected in the circuit, its reading will be :

Accepted Answer

$$I = {V \over {\omega L}}$$
$$ = {{440} \over {100\pi  	imes {{\sqrt 2 } \over \pi }}} = {{44} \over {10\sqrt 2 }}$$
$$ \Rightarrow {I_{rms}} = {I \over {\sqrt 2 }} = {{44} \over {20}} = 2.2\,A$$

Answer

4.4 A

Answer

1.55 A

Answer

2.2 A

Answer

3.11 A

AC fundamentals

An alternating emf $\mathrm{E}=440 \sin 100 \pi \mathrm{t} is applied to a circuit containing an inductance of \frac{\sqrt{2}}{\pi} \mathrm{H}$. If an a.c. ammeter is connected in the circuit, its reading will be :

Choose the correct answer: