An ideal reversed heat engine is used to maintain a low-temperature storage vault at a steady temperature of −23 ∘C-23\text{ }^{\circ}\text{C}−23 ∘C by discharging heat into a surrounding workspace maintained at a temperature of 27 ∘C27\text{ }^{\circ}\text{C}27 ∘C.
Calculate the minimum electrical power input required to run the engine if it rejects heat to the workspace at a rate of 1.35 kW.
29 exam-style questions on AQA A Level Physics Thermodynamics and engines (A-level only), covering First law of thermodynamics (A-level only), Non-flow processes (A-level only), The $p$ - $V$ diagram (A-level only), Engine cycles (A-level only), Second Law and engines (A-level only), and Reversed heat engines (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.