Question

me ajudemmmmm com essas questões

Answer 1

1. a)

$req = 5 + 4 + 130 \\ req = 139 \: ohms$

b)

$req = \frac{1}{ \frac{1}{60} + \frac{1}{40} + \frac{1}{55} + \frac{1}{2} } \\ req = \frac{1}{ \frac{22}{1320} + \frac{33}{1320} + \frac{24}{1320} + \frac{660}{1320} } \\ req = \frac{1}{ \frac{739}{1320} } \\ req = 1.786 \: ohms$

2.

$p = r \times {i}^{2} \\ r = \frac{p}{ {i}^{2} }$

a)

$r = \frac{100}{ {2}^{2} } = \frac{100}{4} = 25 \: ohms$

b)

$r = \frac{200}{ {2}^{2} } = \frac{200}{4} = 50 \: ohms$

c)

$r = \frac{150}{ {2}^{2} } = \frac{150}{4} = 37.5 \: ohms$

3.

$i = \frac{p}{v} \\ i = \frac{8000}{220} = \frac{400}{11} \\ i = 36.36 \: amperes$

4.

$i = \frac{v}{r} \\ i = \frac{220}{254} = \frac{110}{127 } \\ i = 0.866 \: amperes$

Espero ter ajudado (: