3. Your friend's car battery is dead and he calls you to come give him a boost. On the drive over, you think about the electrical circuit required to jump start a car. See the figure below with two identical cars: one has a charged battery with an EMF of 13 V that delivers a maximum current of 433 A (when the battery terminals are short circuited) and the other has a dead battery with an EMF of 12 V that delivers a maximum current of 120 A (when the battery terminals are short circuited). starter key in ignition 0 ww J charged battery jumper cables dead battery jumper cables tim key in ignition starter a. What are the internal resistances of the charged battery and the dead battery? b. What is the resistance of the engine starter in the car with the charged battery if it draws 100 A when the key is turned in the ignition? mm c. How much current is drawn by the starter in the car with the dead battery? If it requires 100 A to start the engine, does it draw enough current?

Introductory Circuit Analysis (13th Edition)
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Publisher:Robert L. Boylestad
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Please answer, a,b,c
3. Your friend's car battery is dead and he calls you to come give him a boost. On the drive over, you
think about the electrical circuit required to jump start a car. See the figure below with two identical
cars: one has a charged battery with an EMF of 13 V that delivers a maximum current of 433 A (when
the battery terminals are short circuited) and the other has a dead battery with an EMF of 12 V that
delivers a maximum current of 120 A (when the battery terminals are short circuited).
starter
ww
key in ignition
charged
battery
jumper cables
dead
battery
jumper cables
ww
key in ignition
starter
a. What are the internal resistances of the charged battery and the dead battery?
b. What is the resistance of the engine starter in the car with the charged battery if it draws 100 A
when the key is turned in the ignition?
ww
c. How much current is drawn by the starter in the car with the dead battery? If it requires 100 A to
start the engine, does it draw enough current?
d. In order to jump start the car with the dead battery, the charged battery is hooked up in parallel
with the dead battery using jumper cables. What is the charging current into the dead battery
(without turning the key in the ignition)?
e. What would the charging current be if you hooked up your jumper cables backwards, such that the
batteries were in series? What do you think might physically happen?
f. If the batteries are hooked up in parallel, and the key is turned in the ignition of the car with the
dead battery, find the current through the starter and through each battery.
g. How much power is each battery supplying? How much power is the engine starter using?
Transcribed Image Text:3. Your friend's car battery is dead and he calls you to come give him a boost. On the drive over, you think about the electrical circuit required to jump start a car. See the figure below with two identical cars: one has a charged battery with an EMF of 13 V that delivers a maximum current of 433 A (when the battery terminals are short circuited) and the other has a dead battery with an EMF of 12 V that delivers a maximum current of 120 A (when the battery terminals are short circuited). starter ww key in ignition charged battery jumper cables dead battery jumper cables ww key in ignition starter a. What are the internal resistances of the charged battery and the dead battery? b. What is the resistance of the engine starter in the car with the charged battery if it draws 100 A when the key is turned in the ignition? ww c. How much current is drawn by the starter in the car with the dead battery? If it requires 100 A to start the engine, does it draw enough current? d. In order to jump start the car with the dead battery, the charged battery is hooked up in parallel with the dead battery using jumper cables. What is the charging current into the dead battery (without turning the key in the ignition)? e. What would the charging current be if you hooked up your jumper cables backwards, such that the batteries were in series? What do you think might physically happen? f. If the batteries are hooked up in parallel, and the key is turned in the ignition of the car with the dead battery, find the current through the starter and through each battery. g. How much power is each battery supplying? How much power is the engine starter using?
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