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

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