Duelling Physicists

About this topic

Revise Energy Transfers, including what does one joule (J) measure, choosing which unit is used for power, a 2\,\mathrm{kW} kettle and a 1\,\mathrm{kW} toaster are switched on for the same time. Which transfers more energy and what happens to the total energy in a closed system.

This topic covers

• what does one joule (J) measure
• choosing which unit is used for power
• a 2\,\mathrm{kW} kettle and a 1\,\mathrm{kW} toaster are switched on for the same time. Which transfers more energy
• what happens to the total energy in a closed system

Example question types

• answer a short question such as “What does one joule (J) measure”
• answer a short question such as “Which unit is used for power”
• answer a short question such as “A 2\,\mathrm{kW} kettle and a 1\,\mathrm{kW} toaster are switched on for the same time. Which transfers more energy”