Can be classified as ① switching apparatus. On and off road and have breaking capacity of the appliance, such as switches, starters, etc. ② fuses. Break overload or short circuit of electrical, high breaking capacity fuses, resettable fuses, etc. ③ relays. Used to control and protect electrical appliances. ④ resistors and rheostats. Changing electrical circuit parameters or converting electricity to heat, such as starting resistance, regulate resistance and starting rheostats, excitation rheostats, and so on. ⑤ regulator. Make certain amount remains unchanged or scheduled changes of electrical appliances. ⑥ electromagnets.
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