Electrical Energy (OCR GCSE Physics A (Gateway Science Suite)): Revision Notes
📚 Revision Notes
2.3.2 Electrical Energy
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Energy Transfers in everyday appliances
Electrical energy may be transferred by the appliance in different ways:
- Kinetic energy for a motor, thermal energy in a kettle
- Work done is when charge flows through a circuit, and is also equal to energy transferred, as all the electrical energy (ideally) gets transferred to the appliance
- The power rating of an appliance shows the power it uses in Watts, so a greater power rating means it uses more energy
Electrical to Kinetic Energy
lightbulbExample
Example: Fan, Blender
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Key Points:
- Energy Transfer: Electrical energy → Kinetic energy of electric motors
- Note: Also produces thermal energy due to friction
Electrical to Thermal Energy
lightbulbExample
Example: Iron, Kettle
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Key Points:
- Energy Transfer: Electrical energy → Thermal energy
- Note: Usually have a higher power rating
Electrical to Kinetic and Thermal Energy
lightbulbExample
Example: Hair dryer, Washing machine
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Key Points:
- Energy Transfer: Electrical energy → Kinetic energy of motors + Thermal energy