Electrical appliances

-Light bulb;

• Useful energy- light from the glowing filament 
• Energy wasted- energy transfer from the filament heating surroundings 

-Electrical heater;

• Useful energy- energy heating surroundings 
• Energy wasted- Light 

-Electric toaster;

• Useful energy- heating bread 
• Energy wasted- heating the toaster case and the air around it 

-Electric kettle;

• Useful energy- heating water 
• Energy wasted- heating the kettle itself 

-Hairdryer;

• Useful energy- Kinetic energy of the air driven by the fan. Energy heating air flowing past the heater filament 
• Energy wasted- Sound of fan motor. Energy heating the hairdryer itself 

-Electric motor;

• Useful energy- Kinetic energy of object driven by the motor. Potential energy of objects lifted by motor 
• Energy wasted- Energy heating the motor and the sound of the motor 

-Computer disc drive;

• Useful energy- Energy stored in magnetic dots on the disc
• Energy wasted- Energy heating the motor that drives the disc