doaaismail23d2001d
doaaismail23d2001d doaaismail23d2001d
  • 03-06-2020
  • Physics
contestada

21. If € = 8.0 V, at what rate is the emf providing energy to the circuit shown?
15 2
10 22
12 V
+
1022.
a. 8.4 W
b. 7.6 W
C.5.6 W
d. 11 W
e. 2.0 W
​

21 If 80 V at what rate is the emf providing energy to the circuit shown15 210 2212 V1022a 84 Wb 76 WC56 Wd 11 We 20 W class=

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sqdancefan
sqdancefan sqdancefan
  • 04-06-2020

Answer:

  c.  5.6 W

Explanation:

We can write the Kirchoff's voltage law (KVL) equations for the circuit using i1 for the clockwise current in the left loop, and i2 for the clockwise current in the right loop. Then the circuit equations are ...

  i1 (10 +10) -i2(10) = 12

  -i1(10) +i2(10 +15) = 8

Using Cramer's rule to find i2, we have ...

  i2 = (12(-10) -8(20))/((-10)(-10) -(25)(20)) = -280/-400 = 0.7

The power supplied by the Emf is ...

  (8 V)(0.7 A) = 5.6 W . . . . . matches choice C

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