MONGU COLLEGE
posted by barotseland network on .
A resistor of 15 ohms and an inductor of 4H and capacitor of 25 micro F are connected in series across 230V AC supply calculate.
a.The frequency
b.current
c.voltage drop or pd across inductance.

I cannot calculate the freq. unless the reactance of the inductor or capacitor is given. I will assume a 230v. 60 Hz supply.
a 60 Hz.
b. Xl = 2pi*F*L = 6.28*60*4 = 1508 Ohms.
Xc = 1/(2p*F*C) = 1/(6.28*60*25*10^6=
106 Ohms.
Z = R + j(XlXc)
Z = 15 + j(1508106)
Z = 15 + j1402 = Rectangular form.
tanA = Xl/R = 1402/15 = 93.5
A = 89.4o
Z = Xl/sinA = 1402/sin89.4=1402.1 Ohms
@ 89.4o = Polar form.
I = V/Z = 230/1402.1=0.164A @ (89.4o)
c. V = I * Xl = 0.164 * 1508 = 247.3 V.