86 EXP. 10. SIMPLE AC CIRCUITS: REACTANCE and IMPEDANCE 3. It was noted previous

Question

86 EXP. 10. SIMPLE AC CIRCUITS: REACTANCE and IMPEDANCE 3. It was noted previously that the inductor contains some internal resistance. If you wanted to reduce the effect of this resistance when measuring L in this procedure, would you want to make measurements at a higher or lower frequency than 1 kHz? 4. If the internal resistance of the inductor is not neglected, then what was measured from the slope of the graph of voltage vs. current across the inductor is not the pure inductive reactance, XL Instead it is the total impedance Z of this circuit with only a resistor and an inductor present Xc = 0, Using the given value of the inductance as L, and your value from the graph as z, calculate the internal resistance of the inductor. Measure the resistance of the inductor directly with an ohmmeter. Do the values agree? Write the answers on the Data Sheet.

Explanation / Answer

3)The frequency should be kept high as in that case the inductive reactance will be very high as compared to the internal resistance of the coil wire.

XL = 2 pi f L

The total impedence of the circuit will be

Z = sqrt [(R + r)^2 + Xl^2]

where r is the internal resistance(obviously, very less) of the inductor

When the current and voltages are known we can find out z and evaluate the va;lue of inductive reactance of the coil and its inductance.

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