Two sleeping bags have fillings of the same thickness. The filling of sleeping bag Y has a higher thermal conductivity than the filling of sleeping bag X. A person sleeps in each bag on equally cold nights. Which statement describes the effect of using sleeping bag Y instead of sleeping bag X?
energy is conducted through the filling at a lower rate, so less energy is transferred from the person to the surroundings each hour
the fillings are the same thickness, so energy is conducted through them at the same rate and the same energy is transferred each hour
more energy builds up in the thermal store of the filling, so less energy is transferred from the person to the surroundings each hour
energy is conducted through the filling at a higher rate, so more energy is transferred from the person to the surroundings each hour
104 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.