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What is the name given to devices whose resistance remains constant as current increases?
Devices whose resistance remains constant as current increases are called "ohmic devices" or "ohmic resistors." These devices follow Ohm's Law, which states that the voltage across the device is directly proportional to the current flowing through it, maintaining a constant resistance regardless of the current levels. Examples include metallic conductors like copper and aluminum at moderate temperatures.
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Does base direct current increase or decrease with temperature?
The base direct current (DC) in semiconductor devices generally increases with temperature. As temperature rises, the thermal energy allows more charge carriers to become available, which enhances conductivity and increases current flow. However, excessive temperature can lead to increased resistance and potential device failure, so there is a limit to this trend. In contrast, for some materials, such as metals, resistance typically increases with temperature, which can decrease the current if voltage remains constant.
What happens if current doubles?
If the current doubles in a circuit, it affects the power consumption and heat generation, as power is calculated using the formula ( P = I^2 R ) (where ( P ) is power, ( I ) is current, and ( R ) is resistance). Doubling the current increases the power consumption by a factor of four, assuming resistance remains constant. This can lead to overheating and potential damage to components if they are not rated to handle the increased current. Additionally, circuit protection devices may trip to prevent hazards.
What happens to the current as the resistor approches infinty?
Most resistors are linear, or 'ohmic', devices -which means that they obey Ohm's Law. So the ratio of voltage to current remains constant for variations in voltage. In other words, their resistance remains constant -providing their power rating isn't exceeded. So you can say that, providing the current increase doesn't cause their power rating to be exceeded, their resistance should remain the same. Resistors wouldn't be of much use if their resistance value changed whenever the current through them changed!
What does doubling the voltage do?
Doubling the voltage in an electrical circuit increases the electric potential difference, which can lead to a higher current if the resistance remains constant, according to Ohm's Law (V=IR). This increased current can enhance the power delivered to devices (Power = Voltage × Current). However, it may also risk damaging components that are not rated for higher voltages, potentially leading to overheating or failure. Proper precautions and ratings are essential when adjusting voltage levels.
What is series combination?
A series combination refers to the arrangement of electrical components, such as resistors or capacitors, in a single path where the current flows through each component sequentially. In this configuration, the total resistance is the sum of the individual resistances, leading to a higher overall resistance. The voltage across each component can vary, but the current remains constant throughout the series circuit. This type of connection is commonly used in various electronic devices and circuits.
Does base direct current increase or decrease with temperature?
The base direct current (DC) in semiconductor devices generally increases with temperature. As temperature rises, the thermal energy allows more charge carriers to become available, which enhances conductivity and increases current flow. However, excessive temperature can lead to increased resistance and potential device failure, so there is a limit to this trend. In contrast, for some materials, such as metals, resistance typically increases with temperature, which can decrease the current if voltage remains constant.
What happens to the current as the resistor approches infinty?
Most resistors are linear, or 'ohmic', devices -which means that they obey Ohm's Law. So the ratio of voltage to current remains constant for variations in voltage. In other words, their resistance remains constant -providing their power rating isn't exceeded. So you can say that, providing the current increase doesn't cause their power rating to be exceeded, their resistance should remain the same. Resistors wouldn't be of much use if their resistance value changed whenever the current through them changed!
Why the resistant in ohmic devices is constant and in non ohmic not constant?
the resistant in ohmic devices is constant because it depend on temperature ..and temperature is constant independent of polarity of potential difference...btin non ohmic the tempt increase with voltage which increase due to the heat increase beacue of power dispition....collision of electrons increases find more resistenc for passing so resistence increases
How does the relationship between resistance and temperature affect the performance of electronic devices?
The relationship between resistance and temperature in electronic devices is important because as temperature increases, the resistance of the device also increases. This can affect the performance of the device by causing it to consume more power, generate more heat, and potentially lead to malfunctions or failures. It is crucial to consider and manage this relationship to ensure the proper functioning and longevity of electronic devices.
What does doubling the voltage do?
Doubling the voltage in an electrical circuit increases the electric potential difference, which can lead to a higher current if the resistance remains constant, according to Ohm's Law (V=IR). This increased current can enhance the power delivered to devices (Power = Voltage × Current). However, it may also risk damaging components that are not rated for higher voltages, potentially leading to overheating or failure. Proper precautions and ratings are essential when adjusting voltage levels.
What is an reactance?
it is a internal resistance of the devices like as capacitor and inductorCommentAs 'resistance' has a very specific meaning, I suggest that the above answer should read: 'It is the opposition of devices like capacitors and inductors (to the flow of current).'
How does connecting devices in parallel affect the electric current in a circuit?
it doesn't, the one with the highest resistance does
How induction motor heatup?
The temperature of all electrical devices will result as a consequence of the current passing through its conductors. In the case of motors, further temperature increases are brought about as a result of bearing friction, windage (air resistance), and eddy-current/hysteresis losses in the rotor and stator.
When voltage increases what happens to current?
Ohm's law states that "The current is directly proportional to the applied EMF (voltage) and inversely proportional to the resistance in the circuit."AnswerIf the voltage across a circuit increases, then the current will increase too. If the ratio of voltage to current is constant for variations in voltage, then the circuit is described as being 'linear' and is obeying Ohm's Law; if the ratio of voltage to current changes (as it would, for example, with tungsten) for variations in voltage, then the circuit is described as being 'non-linear', and is not obeying Ohm's Law. This is because Ohm's Law is not universal, and only applies to certain materials; in fact, most materials and electronic devices do not obey Ohm's Law.
What the characteristic of current?
Current is the flow of electric charge, typically measured in amperes (A). It can be classified as direct current (DC), where the flow is constant in one direction, or alternating current (AC), where the flow periodically reverses direction. The strength of the current depends on the voltage applied and the resistance in the circuit, following Ohm's Law (I = V/R). Current is essential for powering electrical devices and systems.
What law relates to voltage amperage and resistance?
Current is directly proportional to the applied voltage and inversely proportional to the resistance in the circuit. Short form, resistance goes up current goes down, resistance goes down current goes down.This answer is incorrect.First of all, resistance is not affected by a change in voltage or in current. Resistance is only affected by the length, cross-sectional area, and resistivity of the conductor (and, indirectly, by temperature which affects resistivity).Ohm's Law makes no mention of resistance. It simply states that the current flowing in a circuit is proportional to the applied voltage, providing external factors, such as temperature, remain constant.Since current is proportional to voltage, it must be equal to a constant times voltage. This constant is called conductance, which is the reciprocal of resistance, so the so-called 'Ohm's Law formula' is usually shown as I = V/R. But it's important to remember that the resistance, R, is a constant and does not change if V or I changes.
What are devices that obey ohm's law called?
All devices obey Ohm's law. That is why its called a law.The misunderstanding is that Ohm's law does not say that resistance is constant - it says that resistance is voltage divided by current.Very few devices actually have constant resistance. Even the resistor is not constant, due to thermal properties.AnswerI beg to differ with the previous answer. The term you are looking for is a 'linear' device. 'Non-linear' devices, on the other hand, include some semiconducting devices, such as diodes, but also includes certain metals such as tungsten. What it basically comes down to is that if there isn't a linear relationship between current and voltage, then the device is not obeying Ohm's Law!Ohm's Law simply states that, 'providing external factors such as temperature remain constant, then the current flowing in a circuit is proportional to the applied voltage'. It most definitely doesn't say that 'resistance is voltage divided by current'!! In fact, it doesn't even mention resistance!Ohm's Law is not an equation, despite it often being taught as such in high schools by teachers who should know better, but who misinterpret the Law by over-simplifying it (some high school teachers shouldn't even be teaching science, as they are responsible for many other misconceptions too!).For current to be proportional to voltage, there must be a constant of proportionality. This is called conductance, expressed in siemens. However, it is more usual to use the reciprocal of conductance, which is resistance, expressed in ohms, that is: U = R I, where Ris a constant.In other words, Ohm's Law is only true providing resistance is constant. So an incandescent lamp, for example, which uses the non-linear metal tungsten, as a filament, does not obey Ohm's Law. This is because its temperature increases significantly as the voltage across it is increased and, so, the resulting current does not increase proportionally with that voltage. Even 'linear' devices become 'non-linear' at some point, usually at extreme temperatures, once again reinforcing the fact that Ohm's Law only applies providing the temperature doesn't affect resistance.To put it another way, if there isn't a straight line relationship between current and voltage, then the device ain't obeying Ohm's Law!However, for any given voltage, you can certainly use the equation R = U/I to determine what the resistance happens to be at that particular voltage-but that isn't what Ohm's Law says. Ohm's Law isn't about a what happens at a particular voltage! It's about the current remaining proportional to the current over a wide range of voltage variation.
