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February 1, 2015

February 1, 2015

Posted by **Matt Will** on Thursday, August 9, 2012 at 5:53pm.

(a) By inspection, what is the maximum voltage?

V

(b) By inspection, what is the frequency?

Hz

(c) Find the rms voltage across the resistor.

V

(d) Find the rms current in the resistor.

A

(e) Find the maximum current in the resistor.

A

(f) Find the power delivered to the resistor.

W

(g) Find the current when t = 0.0050 s.

A

- physics 102 -
**Elena**, Friday, August 10, 2012 at 9:36amU = 180•sin (70πt).

Umax = 180 V

f=ω/2π=70π/2π =35 Hz,

rms U=Umax/√2= =0.707•Umax=0.707•180=127.3 V

U/R = (180/R)•sin (70πt)

I=(180/13) •sin (70πt)=13.85•sin (70πt)

Imax =13.85 A

rmsI= Imax/√2=0.707•Imax=

=0.707•13.85=9.8 A

Pmax=Imax•Umax=180•13.85=2493 W

P=I•U= 127.3•9.8 =1244.6W

I=13.85•sin (70πt)=

=13.85•si(70π •0.005)=

=13.85•0.89 =12.34 A

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