Difference voltage in LRC-series

AI Thread Summary
The discussion revolves around measuring effective voltages in an LRC-series circuit connected to a transformer. The measured total voltage across the components (3.25V) exceeds the effective voltage supplied by the transformer (2.07V), leading to a difference of 1.18V. Participants question the validity of adding voltages algebraically, emphasizing the importance of phase relationships in AC circuits. Additionally, there is confusion regarding the transformer setup and the frequency of the voltage source, which could affect the measurements. The conversation highlights the need for a deeper understanding of dielectric losses and hysteresis in relation to voltage discrepancies.
Pietervv
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Homework Statement


Our setup:
Connect the transformer to an LRC-series circuit(L= 2mH with iron core,C=1mF and R=10Ω). Use the 2V and 6V outputs of the transformer, the effective voltage supplied by the transformer will then be 2 V.

Use the digital multimeter to measure the effective voltages(Vob) across the LRC-series, and the voltage across each component. Compare Vr+Vc+Vl with Vob. Qualitatively explain the difference.

Well our measured Vob was close to 2V ofcourse:2,07V
Vr=1,85V
Vc=0,68V
Vl=0,72V

So the sum of al the voltages across the components is 3.25V.

So a difference of 1,18V

So my question is how to qualitatively explain the difference

Homework Equations

The Attempt at a Solution


i though the causes are Dielectic losses and losses by hysteresis, but i am not sure about that and i can't argue why these losses will increase the voltage of the components.
 
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Pietervv said:

Homework Statement


Our setup:
Connect the transformer to an LRC-series circuit(L= 2mH with iron core,C=1mF and R=10Ω). Use the 2V and 6V outputs of the transformer, the effective voltage supplied by the transformer will then be 2 V.

Use the digital multimeter to measure the effective voltages(Vob) across the LRC-series, and the voltage across each component. Compare Vr+Vc+Vl with Vob. Qualitatively explain the difference.

Well our measured Vob was close to 2V ofcourse:2,07V
Vr=1,85V
Vc=0,68V
Vl=0,72V

So the sum of al the voltages across the components is 3.25V.

So a difference of 1,18V

So my question is how to qualitatively explain the difference

Homework Equations

The Attempt at a Solution


i though the causes are Dielectic losses and losses by hysteresis, but i am not sure about that and i can't argue why these losses will increase the voltage of the components.
Are you sure about adding the voltages algebraically? Are they in phase?? Use AC fundamentals..
 
Last edited:
It is not clear how using the 2 V and 6 V outputs of the transformer will yield an effective output of 2 V. What aren't you telling us about the transformer setup?

What is the frequency of the voltage source supplying the transformer? It can be location dependent (e.g. European versus North American power standards).
 

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