Starting Lights (8c27p52) When the lights of an automobile are switched on, an a

Question

Starting Lights (8c27p52) When the lights of an automobile are switched on, an ammeter in series with them reads 9.8 A and a voltmeter connected across them reads 12.00 V. See the figure. When the electric starting motor is turned on, the ammeter reading drops to 7.5 A and the lights dim somwhat. If the internal resistance of the battery is 0.042 and that of the ammeter is negligible, what is the emf of the battery when the lights are on? (in V) BO 9.33 EO 2.20 x 101 HO 5.17x 101 CO 1.21 x 10' FO 2.92 × 101 13. AO 7.02 DO 1.65 × 101 GO 3.88 x 101

Explanation / Answer

the emf of the battery when the lights are on is

emf = V + ir

= 12.0 V + (9.8 A)(0.042)

= 12.4 V or 1.24*10^1 V

option (C) is correct answer

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.