11. This is achieved by using a sensitive galvanometer in series with a high resistance. 12. In 1826, Johann Christian Poggendorff developed the mirror galvanometer for detecting electric currents. 13. They indicate the exposure either with a needle galvanometer or on an LCD screen. 14. In 1825 he invented a differential galvanometer for the accurate measurement of electrical resistance. 15. Other early pioneers employed rotating mirrors, or vibrating mirrors known as mirror galvanometers . 16. In 1820 he built the first sensitive galvanometer , naming it after Luigi Galvani. 17. The currents were measured by a sensitive galvanometer . 18. The ideal galvanometer has no / little resistance so surely a huge current flows? 19. Sensitive galvanometers have been essential for the development of science and technology in many fields. 20. Kelvin invented his mirror galvanometer precisely for this task of observing the current change quickly.
