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11. Identify the figures and explain their use. 

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(a) Figure  

(a) is cartridge type fuse which is fitted with costly appliances like refrigerator, AC, geyser, TV etc. They have a proper current rating like 1 A, 2 A, 5 A etc. If the amount of current flow exceeds their ratings the fuse melts thus the circuit opens and current flow stops protecting the appliance from damage during overloading, short-circuiting or faulty in appliances.

B Figure 

(b) Figure represents an MCB. An MCB is a device which functions as a fuse, but does not require replacement. MCB falls down to break the circuit when heavy amount of current flows through it. Once the fault is rectified, the MCB is reset

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