电路分享基础英文PPT (45).pdf
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1、Three Elements of Sinusoidal Quantitym()sin()i tIt=+TmI:amplitudem0I:angular frequency22fT=t+:argument:180i0tmI1 three elements of sinusoidal quantityunit:radians/sinitial phase2IRT()20dTitR t()220dTitR tIR T=201=()dTIittTthe energy consumed in time TR()i tIRT2 effective valueTroot-mean-square value
2、Iiis the effective value of .22mi01sin()dTIIttT=+mm0.7072II=i()2 sin()i tIt=+mi()sin()i tIt=+muu()sin()2sin()u tUtUt=+=+similarly,for voltageWhen this AC happens to be a sinusoidal quantitym 2II=3 phase difference()()u2sinu tUt=+()()i2 sini tIt=+()()uitt=+180ui=The frequency of two sinusoidal quanti
3、ties is required to be the same.0()ui0()ui0=()ui=180=Voltage leads current.(Current lags voltage.)Current leads voltage.(Voltage lags current.)Current and voltage are in phase.Current and voltage are in reverse phase.Answer:BPractice problem:Given,find the phase difference of and .()()omcos 100060Vu tUt=,()()omsin 1000150Ai tIt=+()u t()i tA210B120240C150D()()omcos 100060u tUt=()omsin 100060+90Ut=()msin 1000+30VUt=30150=120=
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