alleryStart learning →A truck battery sets 720 C of charge in motion in 4.00 s while starting an engine. What current does it deliver?
A144 A
B225 A
C180 A
D288 A
Answer & Solution
Correct answer: C. 180 A
1. Current is charge divided by time, I = delta Q / delta t.
2. Substituting the given values, I = 720 C / 4.00 s.
3. That division gives 180 C/s, and one coulomb per second is one ampere, so I = 180 A.
4. 45.0 A would come from dividing the time by the charge, and 2880 A from multiplying instead of dividing.
5. A starter current of this size is expected because a large charge is moved in a very short time.
_Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section 20.1 Current_
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