High School Science - HS-PS3-1 - Tracking Energy: Inputs, Outputs, and Efficiency
6 Questions
A 900 kg elevator car is lifted 30 m. The motor system is 80% efficient (the rest of the input energy becomes thermal energy in the motor and cables).
A solar panel with area of 0.50 mΒ² has 18% efficiency. The solar irradiance varies over time as shown in the table.
An induction cooktop draws 1.6 kW for 2.5 minutes to heat 0.75 kg of water in a 0.50 kg aluminum pot.
A compressed-air canister powers a small turbine connected to a generator.
Define the system as the heat pump device (refrigerant + compressor + coils). The device moves thermal energy from outdoor air to indoor air using electrical energy.
A phone battery has a capacity of 12 Wh. During a 15-minute flashlight use, the battery charge drops by 6%. The LED produces 0.70 W of visible light during that time.
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