A lamp (R = 155 ), an electric heater (R = 24 ), and a fan (R = 49 ) are connected in parallel across a 117 V line.
(a) What total current is supplied to the circuit?
(b) What is the voltage across the fan?
(c) What is the current in the lamp?
(d) What power is expended in the heater?
i m sooo confused,,, i tried all the parts but gettin wrong answers!!!help plz
2007-02-07 03:47:41 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
My results:
a) I = V * (1/r1+1/r2+1/r3) = 8.018 A
b) Vfan = V = 117 V
c) Ilamp = V/rlamp = 0.7548 A
d) P = V*Iheater = V^2/Rheater = 570.37W
2007-02-07 04:01:00 · answer #1 · answered by giovaney 1 · 0⤊ 0⤋
a) I(lamp) = 117/155 A = 0.75 A
I(heater) = 117 / 24 A = 4.88 A
I (fan ) = 117 / 49 A = 2.39 A
Total Current = 8.02 A
b) 117 V
c) I (lamp) = 0.75 A from above
d) P (heater) = 117 x 4.88 watts = 571 watts
2007-02-07 15:08:16 · answer #2 · answered by Como 7 · 0⤊ 0⤋