Question

A battery harnesses a chemical reaction to extract energy in the form of useful electrical work. A certain battery runs a small fan and becomes partially discharged. In the process, it performs a total of 181.1 J of work on its immediate surroundings. It also gives off 5.8 J of heat, which the surroundings absorb. No other work or heat is exchanged with the surroundings. Compute q, w, and ΔU of the battery, making sure each quantity has the proper sign. q = J w = J ΔU = J The same battery is then recharged to exactly its original condition. This requires 407.8 J of electrical work from an outside generator. Determine q for the battery in this process, again making sure it has the proper sign. qcharging = J

          A battery harnesses a chemical reaction to extract energy in the form of useful electrical work. A certain battery runs a small fan and becomes partially discharged. In the process, it performs a total of 181.1 J of work on its immediate surroundings. It also gives off 5.8 J of heat, which the surroundings absorb. No other work or heat is exchanged with the surroundings. Compute q, w, and ΔU of the battery, making sure each quantity has the proper sign.

q =  J
w =  J
ΔU =  J

The same battery is then recharged to exactly its original condition. This requires 407.8 J of electrical work from an outside generator. Determine q for the battery in this process, again making sure it has the proper sign.

qcharging =  J

Added by Carlos P.

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