Anaya Nolan
Nichrome is an alloy of nickel and chromium, sometimes with iron. It is a conductor with a high melting point and a high resistance. Nichrome's resistance remains constant over a wide range of temperatures, and it shows a linear relationship between voltage and current. This means that nichrome obeys Ohm's Law, which states that, when the temperature remains constant, the current through a conductor is directly proportional to the voltage applied across the terminals of the conductor.
| Characteristics | Values |
|---|---|
| Obeys Ohm's Law | Yes |
| Type of Material | Alloy of nickel, chromium, and sometimes iron |
| Melting Point | 1400°C |
| Resistivity | High |
| Resistance | Constant |
| Relationship between Voltage and Current | Linear |
| Type of Conductor | Ohmic |
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What You'll Learn
Nichrome's high resistance
Nichrome is an alloy of nickel and chromium, and sometimes iron. It is considered an ohmic conductor, meaning it obeys Ohm's Law. Ohm's Law states that when the temperature is constant, the current through the conductor is directly proportional to the voltage applied across the terminals of the conductor. Nichrome has a high resistance, which is why it is used in resistors. Its high resistance means that it heats up when an electric current passes through it.
The high resistance of nichrome can be seen as a paradox because, according to Ohm's Law, a lower resistance would generate more heat. However, this paradox can be explained by the fact that typical power sources have a fixed voltage, meaning that the power is inversely proportional to resistance. Therefore, a higher resistance actually results in more power being drawn from the power source, generating more heat.
The high resistance of nichrome is also advantageous because it remains constant over a wide range of temperatures. This is in contrast to materials such as copper, which change resistance substantially as they heat up. This makes nichrome useful for applications where a constant resistance is required, such as in potentiometers, which can be designed to follow a linear, logarithmic, or exponential function.
In conclusion, nichrome's high resistance is a desirable property for certain applications, such as resistors and heating elements, because it allows for the use of relatively small amounts of wire, provides a constant resistance over a wide temperature range, and can draw more power from a fixed-voltage power source, generating more heat.
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Nichrome's linear relationship between voltage and current
Nichrome is an alloy of nickel and chromium, and sometimes iron. It is considered an ohmic conductor because it has a constant resistance, and therefore a linear relationship between voltage and current. This means that when plotting current against voltage, it produces a straight-line graph, indicating that it obeys Ohm's Law.
Ohm's Law states that when the temperature is constant, the current through a conductor is directly proportional to the voltage applied across the terminals of the conductor. In other words, the ratio of voltage to current should remain constant for variations in voltage. Nichrome is specifically designed to retain a constant resistance over a wide range of temperatures, which is why it is considered ohmic or linear.
Materials that obey Ohm's Law, like nichrome, are considered ohmic, while those that do not are called non-ohmic or non-linear. Examples of non-linear materials include thermistors and diodes, which produce curved graph lines when plotting current against voltage. It is important to note that Ohm's Law is not a universal law and does not apply to most cases. In reality, resistance can vary along with voltage and current, complicating the relationship between voltage and current.
Nichrome's high resistance is the reason why it is commonly used in heating elements. Its high resistivity allows for the production of resistors with the required resistance and power ratings using relatively small amounts of wire. This is in contrast to materials like copper, which has lower resistance and would require longer and thinner wire for most applications.
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Nichrome's status as an ohmic conductor
Nichrome is an alloy of nickel and chromium, and sometimes contains iron. It is a material with a high melting point of around 1400°C. Nichrome is considered an ohmic conductor because it has a constant resistance over a wide range of temperatures. This means that, when plotting current against voltage, it produces a straight-line graph, indicating a linear relationship between the two variables.
Ohm's law states that, when the temperature remains constant, the current through a conductor is directly proportional to the voltage applied across the terminals of the conductor. In other words, Ohm's law applies when the ratio of voltage to current is constant for variations in voltage. Nichrome's resistance remains relatively stable when voltage changes, resulting in a straight-line graph when current is plotted against voltage. This straight-line graph is characteristic of ohmic behaviour and indicates that Nichrome obeys Ohm's law.
The ohmic nature of Nichrome can be contrasted with non-ohmic materials such as thermistors, diodes, and semiconductors. These materials produce curved graph lines when plotting current against voltage, indicating a nonlinear relationship between voltage and current. Nichrome's constant resistance and consequent linear relationship between voltage and current distinguish it from these non-ohmic materials.
It is important to note that, while Nichrome is considered an ohmic conductor, no material exhibits perfectly constant resistance in practical applications. Resistance can vary along with voltage and current, complicating the application of Ohm's law. Nonetheless, Nichrome's relatively constant resistance over a range of temperatures makes it a useful material for applications requiring ohmic behaviour, such as in the design of certain potentiometers.
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Nichrome's constant resistance over a wide range of temperatures
Nichrome is an alloy of nickel and chromium, and sometimes iron. It is used in resistors due to its high resistance and high melting point. Nichrome is designed to retain a constant resistance over a wide range of temperatures. This means that, when plotting current against voltage, the graph produced is a straight line. This is because the current through a nichrome conductor is directly proportional to the voltage applied across the terminals of the conductor.
Ohm's law states that, when the temperature is constant, the current through the conductor is directly proportional to the voltage applied across the terminals of the conductor. This is only true when the ratio of voltage to current is constant for variations in voltage. Nichrome's constant resistance over a wide range of temperatures means that it is considered ohmic or linear and that it obeys Ohm's law.
In contrast, conductors that do not obey Ohm's law are called non-ohmic or non-linear. Examples of non-ohmic conductors include thermistors and diodes, which produce curved graph lines. In the case of semiconductors, the current drawn is not proportional to the applied voltage, and the relationship between voltage and current is nonlinear.
It is important to note that Ohm's law is not a universal law and applies to very few conductors and electronic components. In the real world, resistance can vary along with voltage and current, complicating the application of Ohm's law.
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Nichrome's status as an alloy
Nichrome is an alloy of nickel and chromium, and sometimes iron. It is a highly resistant alloy with a high melting point of approximately 1400 degrees Celsius. This is much higher than copper, which has a melting point of 1000 degrees Celsius. Nichrome's high melting point means that it is useful for creating resistors with required resistance and power ratings using relatively small amounts of wire.
The fact that Nichrome is an alloy designed to retain constant resistance contributes to its ohmic behaviour. This is in contrast to materials like copper, which changes resistance substantially as it heats up. Nichrome's resistance remains relatively stable, making it suitable for applications where a consistent resistance is required.
It's worth noting that while Nichrome obeys Ohm's Law, many other conductors do not. Ohm's Law only applies when the ratio of voltage to current remains constant, and in reality, resistance can vary along with voltage and current, complicating the relationship. However, Nichrome's unique properties as an alloy make it one of the materials that exhibit ohmic behaviour.
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Frequently asked questions
Yes, nichrome is considered to be 'ohmic' or 'linear' because it has a constant resistance, which results in a straight-line graph when plotting current against voltage.
Ohm's law states that when the temperature is constant, the current through a conductor is directly proportional to the voltage applied across the terminals of the conductor.
Thermistors and diodes produce curved graph lines and are therefore considered 'non-linear' or 'non-ohmic'.
The rise in temperature of the conductor when the current flows through it can prevent it from obeying Ohm's law.
