KCET2020PhysicsCurrent Electricity
A car has a fresh storage battery of emf 12 ~V and internal resistance 2 10⁻² . If the starter motor draws a current of 80 ~A . Then, the terminal voltage when the starter is On is
Options
- A12 ~V
- B10.4 ~V
- C8.4 ~V
- D9.3 ~V
Correct answer
B. 10.4 ~V
Step-by-step solution
Given, emf of battery, E=12 ~V Internal resistance, r=2 10⁻² Current, I=80 ~A Terminal voltage when starter is ON is given as aligned V &=E-I r &=12-80 2 10⁻² &=12-1.6=10.4 ~V aligned