What will be the voltage across the resistor in an AC circuit?

[jaejoon89]

Homework Statement

Connecting a 250 ohm resistor, 1.2 mH inductor, and 1.8 micro F capacitor in series across a 120 V, 60 Hz peak source, what will the voltage be for the resistor?

Homework Equations

1) I_peak = V_app peak / Z
2) V_R = I_peak * R

?

The Attempt at a Solution

I used equation 1) to get I_peak, and then equation 2) to get V_R which I calculated at 20.1 V. The answer's 14 V and I don't understand how the book is getting this

 

[alphysicist]

Hi jaejoon89,

Homework Statement

Connecting a 250 ohm resistor, 1.2 mH inductor, and 1.8 micro F capacitor in series across a 60 Hz, 120 V peak source, what will the voltage be for the resistor?

Homework Equations

1) I_peak = V_app peak / Z
2) V_R = I_peak * R

?

The Attempt at a Solution

I used equation 1) to get I_peak, and then equation 2) to get V_R which I calculated at 20.1 V. The answer's 14 V and I don't understand how the book is getting this

Were they asking for the peak voltage or the rms voltage across the resistor?

 

[jaejoon89]

Ah ha! I get it now, they want the rms since it's being read by a voltage meter. Thanks!