10. Here we must use wires one thousandth the diameter of a silk thread. 14. AC can be changed into DC, a process called rectification 16. An instrument for measuring current, voltage and resistance, the multi-meter is widely used in the work having connection with electricity. 19. This curve shows the fall in conductivity with increasing temperature.10. Here we must use wires one thousandth the diameter of a silk thread. 14. AC can be changed into DC, a process called rectification. 16. An instrument for measuring current, voltage and resistance, the multi-meter is widely used in the work having connection with electricity. 19. This curve shows the fall in conductivity with increasing temperature