Question

A gas furnace has an efficiency of 75% . How many BTU will it produce from 1000 BTU of natural gas​

Answer 1

Solution : Given data

Efficiency of gas furnace = 75%

Energy input = 1000 BTU (chemical energy )

We know that

Energy output = Efficiency × energy input

= 75% × 1000

= 75/100 ×1000

= 750 BTU (Thermal energy)