# AC Capacitive Circuits

Discussion in 'Homework Help' started by cassyoscar, Apr 9, 2015.

1. ### cassyoscar Thread Starter New Member

Jan 6, 2015
7
0
Hi, was wondering if someone could help me with a few questions?
100uF capacitorr in in parallel with 100ohm resistor connected to a 50hz Supply. The voltage across resistor is 10v. What is... a) current through capacitor b) circuit impedance c) current drawn from supply d) circuit phase angle
e) A 100 μF capacitor is connected in series with a resistor of 100 Ω and connected to a 50 Hz (sinusoidal) alternating voltage supply. The voltage measured across the resistor is 10 V. What is the Voltage of the supply?

Ok here's what I've got so far....

A) I = V/R = 10/100 = 0.1A.
B) Z= 1/√(1/R)²+(wC)² = 30.33Ω
C) not sure which formulas I would need to get this?
D) θ = tan-1(-wCR) = 72.34
E) I = 0.1 A Xc = 31.85 ohm Supply voltage = 3.19v + 10v = 13.19v

Thanks for the help in advance!

2. ### WBahn Moderator

Mar 31, 2012
18,093
4,918
How does V/R tell you the current in the capacitor?

Are these voltages you are talking about the instantaneous voltages or the RMS voltages?