Depends, is the device serial or parallel?
serial device
Serial
Serial ports only allow one device to send and one device to receive at a time, where a parallel port can send and receive data at the same time.
Some key differences between a Serial and Parallel Adder are that a Serial Adder is slower, a Parallel adder is a combinational circuit and the time required for addition depends on the number of bits in a Serial, but not a Parallel. A Serial Adder is a sequential circuit while a Parallel is a combinational circuit.
1.serial adder add bits serially but parallel adder add bits at the same time . 2.serial adder depends on previous outputs but parallel adder does not depends on previous outputs . 3.parallel adder takes less time to execute compared to serial adder.
Both. It depends on the device.
Neither. A computer case is just a box to hold the parts of a computer. It provides no form of communication itself.
It depends on the serial bit rate versus the parallel strobe cycle time but, in general, a parallel interface is faster than a serial interface. However, modern USB, Firewire, and SATA interfaces are very fast, and might be considered faster.
parallel
multiplexer can be used as parallel to serial converter.
A telegraph key.
Usually serial. Parallel is almost completely gone, and serial is getting replaced by USB.