A 801mH ideal inductor is connected to a signal generator at 7 volts maximum, 30

Question

A 801mH ideal inductor is connected to a signal generator at 7 volts maximum, 30 Hz frequency.

1. The phase angle between the current and voltage across the inductor is (approximately):

0° 45° 90° 60° 30°

2. And the current  --- (lags behind) (leads) (is in phase with) (is out of random phase with) the voltage.

3. The magnitude of the maximum current in the circuit is
If the generator frequency is increased the maximum current ----- and the phase shift between the current and the voltage across the inductor---------.

4. In real life an inductor has some internal resistance in the wires making up the coils. How can you tell that we must include the effect of that resistance in the lab? Choose the best answers (more than one can be correct).

a. The phase shift between the current and the voltage across the inductor changes with frequency

b. The coils in the inductor are capable of producing substantial heat

c. The phase shift between the current and the voltage across the inductor is independent of the frequency

d. The maximum current observed in the lab is higher than calculated for an ideal inductor

e. The maximum current observed in the lab is lower than calculated for an ideal inductor

Explanation / Answer

1) 90 degrees

2) cuurent lags behind the voltage

3) inductive reactance, XL = 2*pi*f*L

= 2*pi*30*801*10^-3

= 151 ohms

so, Imax = Vmax/XL

= 7/151

= 0.0464 A

4)

a. The phase shift between the current and the voltage across the inductor changes with frequency

b. The coils in the inductor are capable of producing substantial heat

e. The maximum current observed in the lab is lower than calculated for an ideal inductor

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