3. An inductive coil having a resistance of 15 2 takes a current of 4 A when connected to a 100-V, 60 Hz supply. If the coil is connected to a 100 -V, 50 Hz supply, calculate (a) the current (b) the power (c) the power factor. Draw to scale the vector diagram for the 50-Hz conditions, showing the component voltages. [(a) 4.46 A (b) 298 W (c) 0.669]

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Latches and Flip Flop

Just like logic gates, the latches and flip-flops are the important elements of an electronic circuit. The logic gates form the important part of combinatorial circuits, while the latches and flip-flops form the essential part of a sequential circuit. Sequential circuits form the important concept of automata theory in electronics and electrical engineering, these circuits are a kind of logic circuit whose output depends on both present input and past inputs, that is, the input history.