a coil of resistance 8 ohms and inductance 150 mH is connected in series with a 100uF capacitor across a 240V 50 Hz ac supply. calculate a.) the circuit current, b.) the circuit phase angle, c.) the p.d across the coil, d.) the p.d across the capacitor and e.) the power dissipated.
i have calculated a.)
Xc=1/2piefc
Xc=1/2pie*50*100*10^-6
Xc=31.83 ohms
Xl=2piefl
Xl=2pie 50*150*10^-3
Xl=47.12 ohms
Z=square root r^2 + (Xl-Xc)^2
Z=17.25 ohms
I=V/Z
I=240/18.37
I=13.9 A
b.) as
tan theta=47.12-31.83/8
tan thata=1.911
theta=arctan 1.911
theta= 62.38 degree
for c and d
is pd phase difference, potential drop, power dissipated - any ideas
i have read section in principles of elec technology (cotton) about phase difference but am struggling to understand it and put it into place with the figures/data i have.
e1=OPsinwt
e2=OQsin(wt-theta)
did consider Ur=IR for the couil but was unsure aboutcapacitor
any help/formulas would be welcome
d.)
P=I^2/R
P=13.9^2/8
P=24.15 W
hopefully the rest of my working is correct
i have calculated a.)
Xc=1/2piefc
Xc=1/2pie*50*100*10^-6
Xc=31.83 ohms
Xl=2piefl
Xl=2pie 50*150*10^-3
Xl=47.12 ohms
Z=square root r^2 + (Xl-Xc)^2
Z=17.25 ohms
I=V/Z
I=240/18.37
I=13.9 A
b.) as
tan theta=47.12-31.83/8
tan thata=1.911
theta=arctan 1.911
theta= 62.38 degree
for c and d
is pd phase difference, potential drop, power dissipated - any ideas
i have read section in principles of elec technology (cotton) about phase difference but am struggling to understand it and put it into place with the figures/data i have.
e1=OPsinwt
e2=OQsin(wt-theta)
did consider Ur=IR for the couil but was unsure aboutcapacitor
any help/formulas would be welcome
d.)
P=I^2/R
P=13.9^2/8
P=24.15 W
hopefully the rest of my working is correct
Last edited: