Problem 4.70 6 of 10 review | constants an automobile battery, when connected to a car radio, provides 12.72 v to the radio. when connected to a set of headlights, it provides 12 v to the headlights. assume the radio can be modeled as a 6.54 ω resistor and the headlights can be modeled as a 0.4 ω resistor. part a what is the thévenin equivalent voltage for the battery? express your answer to three significant figures and include the appropriate units. vthv t h = nothing nothing request answer part b what is the thévenin equivalent resistance for the battery? express your answer to three significant figures and include the appropriate units. rthr t h = nothing nothing request answer part c what is the norton equivalent current for the battery? express your answer to three significant figures and include the appropriate units. ini n = nothing nothing request answer part d what is the norton equivalent resistance for the battery? express your answer to three significant figures and include the appropriate units.