- The electrical energy plays vital role in different energy conversion process.
- The following are the energy conversion process in which electrical energy is common in all.
Energy
Conversion
Chemical
– Electrical
Thermal
– Electrical
Sound
– Electrical
Mechanical
– Electrical
Light
– Electrical
- The electrical – Mechanical conversion is the main focus.
Force
on Conductor
- When a current carrying conductor is placed in magnetic field, a mechanical force is produced on the conductor therefore the conductor moves.
- When two current carrying conductors are placed very closed to each other, a force of repulsion is produced when direction of I1 and I2 are opposite.
- A force of attraction is produced when the both conductors carry currents in the same direction.
- This process is reversible it means that if a conductor with closed circuit is moved in the magnetic field an emf is induced and thus current flows through the conductor.
Piezoelectric
Effect
- When voltage gradient is applied in one direction of quartz crystal material, there is change in physical shape of the crystal.
- Conversely when mechanical stress is applied, it produces an electric charge.
- The piezoelectric materials are ceramic resonators, ceramic traps, buzzers, ceramic band pass filters etc.
Magnetostriction
- It is a property of ferro – magnetic materials that causes them to change their physical dimension.
- Conversely when the mechanical force is applied on the ferromagnetic material, there is change in magnetic properties of the material.
- We are familiar with "magnetic hum" which can hear near transformers and high power electrical devices due to effects of magnetostriction.
Force
on iron
- When a soft iron piece is placed in the magnetic field, a mechanical force acts on iron piece.
- The soft iron piece tries to align in the direction of the magnetic field such that maximum flux density is produced.
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