Question

Urgente x favor es para mi hija

Answer 1

56)

Recordando Ley de Ohm :

P = V.I

Donde:

P = Potencia

V = Tension

I = Corriente o Intensidad

I = P/V

I = (750 W)/(230 V) = 3.2089 Amp

Energia consumida es:

E = P*T

Donde:

P = Potencia

T = Tiempo

Tiempo = 1 hora

E = 750 W x 1 h = 750 W-h = 0.75 Kw - h

C) Costo

Regla de 3:

1 Kw-h ===========> 14.22 Centimos

0.75 Kw-h =========>    X

X = [0.75 Kw-h x 14.22 Centimos]/[1Kw-h]

X = 10.665 Centimos

El precio seria de 10.665 Centimos.

44)

Nicromo 1.5 x 10^-6  Ohmios-metro

Area Transversal = 2.5 mm² Pasemos a m²

1 m = 1000 mm

1 m² = (1000 mm)(1000 mm) = 1000000 mm²

2.5 mm² = 2.5/1000000 = 2.5 x10^-6 m²

Recordemos que

R = [(p)(L]/[A]

Donde:

R = Resistencia

p = Resistividad Material [Ohmios - metro]

L = Longitud [metros]

A = Area Transversal [m²]

R = [(1.5 x 10^-6)(34 m)]/[2.5 x10^-6 m²]

R = 20.4 Ohmios.

Cobre: 76 m Longitud

1.68 x10^-8 Ohmios - metro

A = 5 mm² = 5/1000000 = 5 x10^-6 m²

R = [(p)(L)]/[A]

R = [(1.68 x 10^-8)(76 m)]/[5 x10^-6 m²]

R = 0.25536 Ohmios