Physics for Scientists and Engineers II, Summer Semester 2009 1 Lecture 19: July 8 th 2009 Physics for Scientists and Engineers II.

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Presentation transcript:

Physics for Scientists and Engineers II, Summer Semester Lecture 19: July 8 th 2009 Physics for Scientists and Engineers II

Physics for Scientists and Engineers II, Summer Semester RLC Series Circuits –solved using Kirchhoff’s loop

Physics for Scientists and Engineers II, Summer Semester RLC Series Circuits –solved using Kirchhoff’s loop

Physics for Scientists and Engineers II, Summer Semester RLC Series Circuits –solved using Kirchhoff’s loop

Physics for Scientists and Engineers II, Summer Semester RLC Series Circuits –solved using Kirchhoff’s loop

Physics for Scientists and Engineers II, Summer Semester RLC Series Circuits –solved using Kirchhoff’s loop

Physics for Scientists and Engineers II, Summer Semester RLC Series Circuits - book’s method

Physics for Scientists and Engineers II, Summer Semester RLC Series Circuits - book’s method

Physics for Scientists and Engineers II, Summer Semester Phasor Diagram The voltages across the components are out of phase as shown in the phasor diagram. They need to be added as vectors to get the total voltage.

Physics for Scientists and Engineers II, Summer Semester Phasor Diagram The voltages across L and C can simply be subtraced from each other (180 degrees out of phase).

Physics for Scientists and Engineers II, Summer Semester Phasor Diagram

Physics for Scientists and Engineers II, Summer Semester Power in an AC Circuit

Physics for Scientists and Engineers II, Summer Semester Power in an AC Circuit “Power factor”

Physics for Scientists and Engineers II, Summer Semester Implications of power factor “Power factor”

Physics for Scientists and Engineers II, Summer Semester Resonance in a Series RLC Circuit – the current

Physics for Scientists and Engineers II, Summer Semester Resonance in a Series RLC Circuit – the Current

Physics for Scientists and Engineers II, Summer Semester Resonance in a Series RLC Circuit – power

Physics for Scientists and Engineers II, Summer Semester Resonance in a Series RLC Circuit – power Describes sharpness of resonance. Q is larger for smaller R.

Physics for Scientists and Engineers II, Summer Semester AC Transformer – a simple design Primary Winding (input) Secondary Winding (output)

Physics for Scientists and Engineers II, Summer Semester AC Transformer - Voltage Transformation

Physics for Scientists and Engineers II, Summer Semester Step-up versus Step-down Transformers

Physics for Scientists and Engineers II, Summer Semester AC Transformer – Connecting the load rms values

Physics for Scientists and Engineers II, Summer Semester Transmission line economics

Physics for Scientists and Engineers II, Summer Semester Transmission line economics