1.A heat engine is rejecting 200btu/h and 30% efficient, how much power does it use in watts? 2. QH=w+QC and power=energy/time (1kwh=3412btu) and a power diagram: QC= wasted heat, w=work QH l 30%l---->W l QC 3. 200btu/h(1kwh/3412btu)(1000w/1kw)=58.6watts (30%)=17.6watts This value just seems too small??