Answer / kingshuk dey

Digital signals: They are wither ON or OFF state. That is 0 or 1. Like if a lamp is glowing or not.

Analog signal is a range of values that lie between ON and OFF. Like the position of gate between the "OPEN" and "CLOSE" position. Like, 45 degrees open. So the signal is between 4 to 20 mili-amps normally (4 amps is FULLY OPEN and 20 amps is FULLY CLOSED). 4 amps corresponding to 0% and 20 amps for 100%.

In 110V DC supply,if a closed circuit gets open, How can we identify the voltage which is measured after the resistor(4KOhm) which is open with negative.it shows 55V +ve when measured, also the actual positive source is 55V +ve .Because there is no voltage drop in open circuit. How can we identify whether this is the voltage which is series with the resistor or the DC source direct +ve.

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