- #1
Ahmad Syr
- 20
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Hi guys I just want to know why is the current directly proportional to the voltage is that because voltage increase the speed of electrons?? or ,just increase the number of electrons?
Thanks in advance
Thanks in advance
analogdesign said:[...]
So [STRIKE]high potential is high voltage[/STRIKE] High voltage is large difference between potentials. [...] If you put a large [STRIKE]potential[/STRIKE] voltage across a small resistor you'll get a large current. ( I = V/R)
Ahmad Syr said:So you mean when the voltage is high it creates stronger electric field and more electrons predominate in the direction of the field and more electrons mean more current right !??!
gerbi said:Voltage is calculated as difference between potentials. Do not confuse these terms.
analogdesign said:This may be true in physics, but in electrical engineering the terms are used interchangeably. If you insist on distinct definitions you will be very confused by a lot of the EE literature and circuit design lore.
sophiecentaur said:Hmm. I know that a Voltmeter is never called a PD meter but I don't think there's much opportunity for confusion if you start from the definitions and use them properly. There is a lot of engineering slang that gets in the way of proper understanding of a lot of EE. Terms like "Amperage" and 'Current Draw', for instance, come in from a practical side of things which is hardly even 'Engineering', with a capital E. "Lore" is not the best source of informed knowledge, if you want to get things right and it can be a struggle if someone has only that sort of knowledge available. A certain amount of 'unlearning' is often necessary, to make the transition from acquaintance to a serious understanding.
At least there is PF; available for nearly everyone in the World, these days. A bit fussy and pedantic at times, perhaps, but a good rock to anchor your EE learning to.
Current is proportional to voltage because of Ohm's Law, which states that the current flowing through a conductor is directly proportional to the voltage applied across it, given that the temperature and other physical conditions remain constant.
Ohm's Law is based on the concept of resistance, which is the measure of how difficult it is for current to flow through a material. When voltage is applied to a conductor, it creates an electric field that pushes the free electrons in the material to move and create a current. The amount of current that flows is directly proportional to the voltage, as long as the resistance remains constant.
One example is a simple circuit with a resistor and a power source. If the voltage of the power source is doubled, the current flowing through the circuit will also double, as long as the resistance of the resistor remains the same.
No, the relationship between current and voltage is not the same for all materials. Materials that have a constant resistance, such as most metals, will follow Ohm's Law. However, materials like diodes, which have a nonlinear relationship between current and voltage, do not follow Ohm's Law.
Ohm's Law is used in many practical applications, such as in electrical circuits and devices. It helps engineers and scientists understand and predict the behavior of electricity, allowing them to design and create efficient and reliable systems. It is also used in fields such as electronics, telecommunications, and power systems.