Question

steam engine delivers 4.8X10]⁸j of work per minute and services 1.2 X10⁹] of heat per minute from its boilty. what is the percentage efficienty of the engine
(a)20% b) 30% (c) 40% (d) 50%​

Answer 1

• Total energy =4.8×10^8J
• Used energy=1.2×10^9J

We know

$\boxed{\sf \℅ Efficiency=\dfrac{Used\:Energy}{Total\:Energy}\times 100}$

$\\ \sf\longmapsto \℅Efficiency=\dfrac{1.2\times 10^8}{4.8\times 10^{9}}\times 100$

$\\ \sf\longmapsto \℅Efficiency=25\℅$