Daya dan Efisiensi

P input

\begin{equation*}
\begin{split}
W & = - \Delta E_p \\\\
W & = - (EP_2 - EP_1) \\\\
W & = - (m \: g \: h_2 - m \: g \: h_1) \\\\
W & = m \: g (h_1 - h_2) \\\\
W & = 1000 \: 10 (20 - 0) \\\\
W & = 200.000 \text{ J}
\end{split}
\end{equation*}

Efisiensi

\begin{equation*}
\begin{split}
\eta & = \frac{P_{\text{output}}}{P_{\text{intput}}} \times 100 \% \\\\
40 \% & = \frac{P_{\text{output}}}{200.000} \times 100 \% \\\\
P_{\text{output}} & = 80.000 \text{ Watt}
\end{split}
\end{equation*}