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6. Find the wrong statements and correct them:
1. Electrical energy determines the nature of the method used to produce the
energy.
2. The electricity using chemical method is produced in primary cells by
chemical actions.
3. Due to electromagnetic method the electricity is produced in generators by
operation of conductors moving through a magnetic field.
4. In thermo-electric method a very small voltage is produced across faces of a
crystal by applications of a mechanical pressure.
5. In piezo-electric method a very small voltage is produced by the heating of the
junction between two metals. Piezo-electric method is employed in practice
for various generators.
6. Chemical method is used for purposes of temperature measurement.
7. Electronic method is used as a means of frequency control.
8. In thermionic emission electrons are liberated at the surface of substances by
the action of light.​