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Chapter 21: Q18CQ (page 772)

Semi-tractor trucks use four large\({\rm{12 - V}}\) batteries. The starter system requires \({\rm{24}}\;{\rm{V}}\), while normal operation of the truck鈥檚 other electrical components utilizes \({\rm{12}}\;{\rm{V}}\). How could the four batteries be connected to produce \({\rm{24}}\;{\rm{V}}\)? To produce \({\rm{12}}\;{\rm{V}}\)? Why is \({\rm{24}}\;{\rm{V}}\) better than \({\rm{12}}\;{\rm{V}}\) for starting the truck鈥檚 engine (a very heavy load)?

Short Answer

Expert verified

A larger voltage gives more power. Thus, \({\rm{24\;V}}\) battery is used in the starter system.

Step by step solution

01

Relation between power and voltage

Power and voltage are proportional to each other if the current is kept constant

02

Step 2: Connection of batteries to get \({\rm{24V}}\)

For creating a voltage \({\rm{12\;V}}\), connect two batteries in parallel, whereas connect two in series to generate a voltage \({\rm{24\;V}}\). It is better to put \({\rm{24\;V}}\)for starting a heavy load because a lower voltage will not be able to produce the required power as the applied resistance will be higher.

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