# meaning of voltage drop

I think that you will find that a "voltage drop" is the generally accepted term to indicate that a voltage is developed across a resistive element when a current is passed through that resistance. The "voltage drop" occurs across the terminals of the resistance, and this "drop" is taken away from other elements in the circuit - eg.
100 Ohms is placed across a 100 Volt source. One ampere will flow. An additional 1 Ohm resistance is connected in series with the 100 Ohm load. The 1 Ohm resistance will develop a (almost) 1 Volt drop across its terminals, leaving less than 100 Ohms to be developed across the load.
Current limiting resistors are often refered to as "dropper resistors", because of what they do.
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the volatge drop and the voltage difference are two different way of understanding the same thing.. suppose a 5V voltage source and two resistances connected to it in series to it. if the first resistance shows a voltage 2v across it the other resistor will show 3V. this way voltage across the resistors reduces the source voltage drop from 5V to 3V or 2V thus it is termed as voltage drop.(if open circuited, the source wd hv shown 5V intead of 3V or 2V) another way of understanding it is way of voltage difference concept. if we see the same examle, the source has 5V and the second resistor shows 3V the voltage drop or potential difference across the first resistor will be 5-3= 2V
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