Automobile Battery Has Emf Of 12

An automobile battery has an emf of 12.6 V and an internal resistance of 0.080 0 Ω. The headlights together present equivalent resistance 5.00 Ω (assumed constant). What is the potential difference across the headlight bulbs?
(a) When they are the only load on the battery and 1.
(b) When the starter motor is operated, taking an additional 35.0 A from the battery?

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