Two automobile batteries are connected in parallel to power a wheelchair. Each o

Question

Two automobile batteries are connected in parallel to power a wheelchair. Each of the batteries has a 12.0 V emf and internal resitance 0.020 Ohms and the wheelchair motor has resistance 1.0 Ohms. Find the current delivered to the motor. What would be the current delivered to the motor if the batteries were connected in series? Consider the relative advantages of connecting batteries in series or parallel.



Two automobile batteries are connected in parallel to power a wheelchair. Each of the batteries has a 12.0 V emf and internal resitance 0.020 Ohms and the wheelchair motor has resistance 1.0 Ohms. Find the current delivered to the motor. What would be the current delivered to the motor if the batteries were connected in series? Consider the relative advantages of connecting batteries in series or parallel.

Explanation / Answer

1)when in parallel,

equivalent resistance of =0.1 ohm

so,V/0.01=12/0.02+12/0.02

or V=12 V

so the current=12/(1+0.01)

=11.88 A

2)when in series, E=12+12

=24 ohm

nbet resistance=1+0.02+0.02

=1.04

so current=24/1.04

=23.08 A

in series, the current is larger

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