What is the equivalent resistance between points a and b when R- 30 97 a. 27 S2

Question

What is the equivalent resistance between points a and b when R- 30 97 a. 27 S2 b, 2162 c. 24 S2 d. 18? e.7.5? 1 12 V i gure The enif and the internal resistance of a battery are as shown. 10) In Fig 25.2, a current of 6.0 A is drawn from the battery. The terminal voltage of the battery Vab is closest to: C) +24 V D) -12 V E) -24 V A) zero B) 12 V t0) In Fig, i548, a 3.0-ohm cable is connected across the battery. The rate at which chemical energy in the battery is depleted is closest to: C) 29 W D) 32 W E) 34 W A) 24 W B)27w PAGE 4

Explanation / Answer

9) d) 18 ohms

R_upper = R + R*R/(R + R)

= R + R/2 + R

= 1.5*R

= 1.5*30

= 45 ohms

R_lower = R = 30 ohms

Req = R_upper*R_lower/(R_upper + R_lower)

= 45*30/(45 + 30)

= 18 ohms

10) A) zero

Vab = 12 - 2*I

= 12 - 2*6

= 0 V

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