Greetings,in case of signals we always deal with voltage why not

In summary, the difference between voltage and current is that voltage is associated with electric effects while current is associated with magnetic effects. While both can be used for signals, voltage is typically used for change in circuits due to its ease of use and availability of components. However, current is used in cases where magnetic effects are required, such as in waveguides and cathode ray tubes. Additionally, current is the signal used for power as it directly relates to load in mains supply. However, current can exist without voltage, as demonstrated in numerous examples.
  • #1
amaresh92
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greetings,
in case of signals we always deal with voltage why not current?
 
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  • #2


Hello amaresh,

in case of signals we always deal with voltage why not current?

First of all we don't, but I will come to that.

A signal is about change of something.
Think about circuits, what opposes change of current and change of voltage in a circuit?
Which can achieve the greatest rate of change with real components?

Change of current is associated with inductance, whereas change of voltage is associated with capacitance. Alternatively you could say that voltage change is about electric effects and current change is about magnetic effects.

Traditionally inductors have been harder to provide than capacitors, except in the earliest days when wound components were actually easier.

Either way current signals are used when magnetic effects are required, for instance in waveguides, the magnetic sweep circuits in cathode ray tubes, etc.
The signal is also current when considering power. It is the current which varies with load in mains supply, not the voltage. The voltage contains no information about the power directly, the current contains it all and is therefore the signal.

go well
 
  • #3


but in reality what is the difference between current and voltage?
advanced thanks
 
  • #4


I don't understand.

If you don't know the difference between voltage and current why did you ask your original question?
 
  • #5


greetings,
actually current can't exist without voltage the,then indirectly we are dealing with voltage.
thanks
 
  • #6


actually current can't exist without voltage

Of course it can.

There's lots of threads about this here with lots of examples, do a forum search.
 

1. Why do we always deal with voltage in signals?

Voltage is a measure of the electrical potential difference between two points. In the context of signals, voltage represents the strength or magnitude of the signal. It is a convenient way to measure and manipulate signals as it can be easily converted to other forms such as current or power.

2. Can other physical quantities be used to represent signals instead of voltage?

While voltage is the most commonly used quantity to represent signals, other physical quantities such as current, power, or even light can also be used. However, these quantities may require additional equipment or may not be as easily manipulated as voltage.

3. Are there any advantages of using voltage to represent signals?

Yes, there are several advantages to using voltage to represent signals. Voltage is a measurable quantity that can be easily manipulated using electronic components, making it ideal for transmitting and processing signals. Additionally, voltage signals are less susceptible to interference and noise compared to other physical quantities.

4. Are there any limitations to using voltage in signal processing?

One limitation of using voltage to represent signals is that it is a relative measure and can vary depending on the reference point. This means that voltage signals must be referenced to a common ground in order to be accurately measured and processed. Additionally, voltage signals may also be affected by factors such as resistance, capacitance, and inductance in a circuit, which can distort the signal.

5. Can we use voltage to represent all types of signals?

While voltage is commonly used to represent electrical signals, it may not be suitable for all types of signals. For example, in the case of digital signals, voltage is used to represent binary values of 0 and 1. However, other types of signals such as audio or video signals may require different methods of representation.

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