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Understand the qualitative concept of efficiency in energy transfer processes.

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Cambridge IGCSE Combined ScienceMotion, forces and energyCore content

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Understand the qualitative concept of efficiency in energy transfer processes

This point belongs to Energy, work and power, especially Energy, work and power outcomes.
You need to be able to understand the qualitative concept of efficiency in energy transfer processes.
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Paper 3 structured question: Energy, work and power

Paper 3Theory (Core)2 marks

Description

Energy Transfer in Appliances

Consider an electric kettle that uses 2000 J of energy to heat water. If it successfully heats the water to the desired temperature, the useful energy output is 1800 J.

a
Analyse Calculate the efficiency of the kettle.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Related learning objectives

Identify the various forms in which energy can be stored, including kinetic, gravitational potential, chemical, elastic (strain), nuclear, electrostatic, and internal (thermal) energy.
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Explain how energy is transferred between different stores during various events and processes, providing examples such as mechanical work, electrical work, heating, and energy transfer through waves.
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Understand and apply the principle of conservation of energy to simple scenarios, including the ability to interpret basic flow diagrams.
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Recall and apply the formula for calculating kinetic energy, represented as E_k = 1/2 mv^2.
Energy, work and power outcomes
Recall and apply the formula for the change in gravitational potential energy, expressed as ΔE_p = mgΔh.
Energy, work and power outcomes

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