An automobile battery has an emf of 12.6 V and an internal resistance of 0.0500 2. The headlights together have an equivalent resistance of 6.70 2 (assumed constant). (a) What is the potential difference across the headlight bulbs when they are the only load on the battery? (Enter your answer to at least two decimal places.) 12.46 X V (b) What is the potential difference across the headlight bulbs when the starter motor is operated, with 35.0 A of current in the motor? (Enter your answer to at least two decimal places.) 10.79 x v

A battery has an emf of 15.0 V. The terminal voltage of the battery is 10.8 V when it is delivering 26.0 W of power to an external load resistor R. (a) What is the value of R?  (b) What is the internal resistance of the battery?

A certain car battery with a 12.0 V emf has an initial charge of 136 A · h. Assuming that the potential across the terminals stays constant until the battery is completely discharged, for how many hours can it deliver energy at the rate of 130 W? _______________h (please show units when you work this out so that I can follow it easier.)

(a) Given a 52.0 V battery and 20.0 Ω and 84.0 Ω resistors, find the current (in A) and power (in W) for each when connected in series. I20.0 Ω= A P20.0 Ω= W   I84.0 Ω= A P84.0 Ω= W (b)Repeat when the resistances are in parallel. I20.0 Ω= A P20.0 Ω= W  I84.0 Ω= A P84.0 Ω= W

Four 20.0 W resistors are connected in parallel and the combination is connected to a 20.0 V ideal battery. The current in any one of the resistors is: