ELECTRO-MECHANICAL ENERGY APPLIANCES

Definition and examples of Electro-mechanical Appliance 

Electro-mechanical energy appliances convert electrical energy into mechanical energy.
Examples of electro-mechanical appliances are fruit blenders, seed-shelling machines, cassava grinders, pepper grinders, and kernel-shelling and crushing machine.


Working Methods of a Fruit Blender and a Cassava Grinder

The fruit blender is made up of a power plug which connects to power supply, a switch which controls power, a housing which contains a motor, the motor which drives a pulley, the pulley which turns blades and a cup which contains the blades which grind fruits.
The cassava grinder has similar parts as the fruit blender. It also works in the same way as the fruit blender. It is made of the following:
a) A cup which holds the peeled cassava tubers to the ground;
b) A motor which rotates when electricity is fed into it;
c) The blades which grind the cassava; and
d) A pulley which connects the blades to the motor.
The motor rotates when current flows through it. The rotating motor turns the blades which are connected to it through the pulley. The rotating blades grind the cassava in the cup.

Working Methods of a Refrigerator and an Air Conditioner

The parts of a fridge are the same as those of an air conditioner. These are compressor, condenser, evaporator, fan, and a few vents.

The fridge operates with gas (refrigerant) which could be Freon, ammonia or alcohol. The operation of a fridge is guided by the principle that fluid absorbs heat when changing from a liquid state to a vapour state, and gives up heat while changing from a vapour state to a liquid state. This heat is called latent heat. Electrical energy enters the fridge through the compressor. The compression of gas is mechanical work.

Summary
1) The appliances we use in our houses work on energy conservation principles. While some appliances depend on conversion of electrical energy to mechanical energy, others depend on conversion of electrical energy to heat energy for their operation.

2) The fridge, freezer, air conditioner, electric fan and the electric grinder depend on energy conversion from electrical to mechanical; while the electric kettle, soldering iron, electric pressing iron, water heater, and the electric cooker operate by converting electrical energy into heat energy.


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