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ACandRLC2

# ACandRLC2 - Discussion about the mid-term 8 In those hard...

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1 Discussion about the mid-term 8. In those hard times, people connected two light bulbs in series to prolong the lifetime of them so as to save money on light bulbs. If a person connects two 40W/220V light bulbs in series to a 220V line, what is the actual power consumed by one light bulb in this configuration? assuming the filament’s resistance does not change much with temperature.

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2 Discussion about the mid-term 10. Calculate the power consumed by R1 and the potential at point A.
3 Alternating Current and RLC Circuits Power of RLC in AC circuits Only the R (resistor) consumes power. The C and L store energy, but do not consume it. Power consumed by a resistor is P R = RI 2 = RI 2 MAX SIN 2 ( ωt+φ ) at time t . Average over one period, one gets the average power consumed of the RLC in an AC circuit with V = V MAX SIN( ωt ) P avg = I rms V rms COS( φ ) where Z is the impedence φ is the phase angle between the current and voltage.

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ACandRLC2 - Discussion about the mid-term 8 In those hard...

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