Because if it is not connected to both it is not a full circuit and therefore if it is not a full circuit then the fuse can't protect you.
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The cathode and anode are simply two terminals of a semi-conductor junction. In a normal diode, forward bias occurs when the anode is more positive than the cathode.
Recombination of negative and positive charge carriers
The terminals H1 and H2 an a transformer indicate the primary side of the transformer. The secondary side is usually identified as X1 and X2.
Commutators are used to get unidirectional current Flow through the external circuits in DC generator system.A commutator is an electrical switch that periodically reverses the current direction in an electric motor or electrical generator.
The parallel-tuned filter in antenna circuit rejects only the undesired frequencies.