Complex circuit questions help please. best answer is first answer?

Question

4: In a series circuit, four resistors of values 15 ohms, 20 ohms, 35 ohms, and 5.0 ohms are considered. What is the equivalent resistance of the entire circuit?

75 ohms

65 ohms

5.0 ohms

5.3 x 104 ohms

5: In the above question, if the emf source is providing 12 volts of electric potential difference, what is the equivalent current of the entire circuit?

1.6 x 101 A

6.3 x 10-2 A

1.6 x 10-1 A

6.3 x 101 A

6: In the series circuit in questions #4 and #5, what is the power of the entire circuit?

9.0 x 102 Watts

1.9 x 100 Watts

9.0 x 10-1 Watts

1.9 x 101 Watts

Answer 1

4:R eq =R1+R2+R3....in series circuits so answer is 75 ohms

5:I=V/Req ,12 / 75 = 0.16 amps

6:W=I^2 x Req = >{16/(100) x 16/(100)} x 75 =1.92 watts

Answer 2

4) the sum. 75 ohms

5) I = E/R = 12/75 = 0.16 amps or 160ma

6) P = EI = 12*.16 = 1.92 watts

.

Answer 3

4. In a series circuit, you just add up the values of the four resistors. 15 + 20 + 35 + 5.0 = 75 ohms

5. Using the equation R = V/I (Resistance = Voltage/Current), you can find the total current. 75 = 12/I so I = .16 = 1.6 x 10-1 A

6. You can you the equation P = VI (power = voltage x current). P = 12 x 1.6 x 10-1 = 1.9 = 1.9 x 10^0