Question

8) If a battery can release 541 J of energy and 478 J are used for work, how much energy is released as heat?

Answer 1

Answer:

$-63\text{ J}$

Explanation:

Here, we want to know the amount of energy that was released as heat

Mathematically, we know that:

$\Delta E\text{ = Q + W}$

Where:

delta E is the change in Energy

Q is the heat

W is the work done

Substituting the values, we have it that:

$\begin{gathered} -541\text{ J = -478 + Q} \\ Q\text{ = -541J + 478 J = -63 J} \end{gathered}$

Kindly note that Q is negative because energy is released by the system

Also, W is negative as work is done by the system