Gavin Howe
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. Conductors that obey Ohm's Law are called ohmic conductors and are identified by plotting a graph of current against voltage; if the graph is a straight line, the conductor is ohmic, and if the graph is a curve, the conductor is non-ohmic. Nichrome is an alloy of nickel and chromium that is designed to retain a constant resistance over a wide range of temperatures. Thus, when plotting current against voltage, nichrome produces a straight-line graph, indicating that it is an ohmic conductor and that Ohm's Law applies.
| Characteristics | Values |
|---|---|
| Does Ohm's Law apply to Nichrome? | Yes |
| Nichrome's melting point | 1400 degrees Celsius |
| Nichrome's resistivity | 100 Ohm-metre |
| Nichrome's resistance | 10 ohms |
| Nichrome's length | 510mm |
| Nichrome's current | 0.9A |
| Nichrome's power | 8.1W |
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What You'll Learn
Nichrome is an alloy of nickel, chromium, and sometimes iron
Nichrome, also known as NiCr, is an alloy of nickel and chromium, with the chemical formula NiCr. In some cases, it may also contain iron, in which case its chemical formula becomes NiFeCr. The alloy is known for its versatility and unique properties, which make it suitable for a wide range of applications.
The ratio of nickel to chromium in Nichrome is typically 80% to 20%, respectively. This composition, known as Nichrome 80/20, exhibits a silver-grey hue and exceptional resistance to electrical flow and heat, and corrosion. It has a high melting point of approximately 1,400°C, making it a sought-after material in various industries.
The presence of iron in Nichrome alloys is optional and depends on the specific composition and requirements of the alloy. The inclusion of iron, along with the exact ratios of nickel and chromium, play a crucial role in determining the final properties of the alloy. These properties include wear resistance, oxidation resistance, and high-temperature performance.
The process of creating Nichrome alloys involves carefully selecting and weighing raw materials, which are usually in the form of pellets or powders, to achieve the desired composition. The materials are then placed in a controlled furnace environment to prevent impurities and ensure uniform melting. The resulting molten alloy is thoroughly mixed to promote homogenization and a consistent distribution of elements.
Nichrome is commonly used in heating elements, such as toasters, electrical kettles, and space heaters. It is also used in various industries, including aerospace, pyrotechnics, and 3D printing. Nichrome wire, when heated, develops an outer layer of chromium oxide, which protects it from oxidation and gives it high mechanical strength.
In conclusion, Nichrome is an alloy primarily composed of nickel and chromium, with the potential inclusion of iron, depending on the specific requirements of the alloy. Its unique properties, such as corrosion resistance, durability, and high melting point, make it a valuable material in numerous applications across different industries.
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Nichrome is designed to retain constant resistance over a wide temperature range
Nichrome is an alloy of nickel and chromium, and sometimes iron. It is specifically designed to retain a constant resistance over a wide temperature range. This property makes it ideal for applications requiring specific resistance characteristics, such as in heating elements and resistors.
Nichrome's resistance increases with temperature. As the temperature rises, the atoms in the wire vibrate more intensely, making it harder for electrons to pass through, which increases resistance. Despite this, Nichrome maintains a relatively constant resistance value over a broad temperature range. This is in contrast to some other materials, which may see a significant shift in resistance with temperature changes. Nichrome's ability to withstand high temperatures without a significant change in its resistive properties adds to its versatility.
The stable resistance of Nichrome wire allows for precise control of current flow in electronic circuits. This property, combined with its resistance to oxidation and corrosion, makes Nichrome a preferred material in many heating and electrical applications.
Nichrome's resistance can be calculated using the formula R=ρA/L, where R is resistance, ρ is resistivity, L is length, and A is the cross-sectional area. The resistivity of Nichrome wire changes as temperature increases, and this change is known to be non-linear for significant temperature variations. However, over a small temperature range, the change in resistivity can be approximated to be linear.
Ohm's Law applies when the ratio of voltage to current remains constant as voltage varies. Nichrome's constant resistance over a wide temperature range means that it produces a straight-line graph when plotting current against voltage. Therefore, Nichrome obeys Ohm's Law and is considered ''ohmic' or 'linear'.
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Ohm's Law applies when plotting current against voltage results in a straight line
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. This means that if you plot a graph of current against voltage, and the result is a straight line, then Ohm's Law applies.
Nichrome is an alloy of nickel and chromium (and sometimes iron). It is designed to retain a constant resistance over a wide range of temperatures and, therefore, has a linear relationship between voltage and current. This means that when you plot current against voltage for nichrome, you will get a straight-line graph, and so it obeys Ohm's Law.
This is in contrast to non-ohmic conductors such as thermistors and diodes, which produce curved graph lines and are, therefore, considered to be 'non-linear' or 'non-ohmic'.
It is worth noting that Ohm's Law is not a universal law and applies to very few conductors and hardly any electronic components.
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Nichrome is considered 'ohmic' or 'linear'
Nichrome is considered "ohmic" or "linear" because it produces a straight-line graph when plotting current against voltage. Ohm's Law applies when the ratio of voltage to current is constant for variations in voltage, and this is indeed the case for nichrome.
Nichrome is an alloy of nickel and chromium, and sometimes iron. It has a high melting point of around 1400 degrees Celsius. Nichrome is specifically designed to retain a constant resistance over a wide range of temperatures. This is in contrast to other materials such as copper, which changes resistance substantially as it heats up. Nichrome's high resistance means that resistors can be made with relatively small amounts of wire.
The relationship between voltage, current, and resistance is described by Ohm's Law. Ohm's Law states that the current generated by a heating element is proportional to the resistance. In other words, for a fixed voltage, the power is inversely proportional to the resistance. This is why nichrome wire is used in heating elements: for a given voltage, a higher resistance will produce more heat.
However, it is important to note that Ohm's Law is not a universal law. In fact, it only applies to a limited number of conductors and hardly any electronic components. The law assumes that resistance is constant, which is not the case in the real world. Nevertheless, nichrome does display linear behaviour and is therefore considered ohmic.
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Ohm's Law is not universal
Ohm's Law states the relationship between electric current and potential difference. The law states that the current flowing in a conductor is directly proportional to the voltage applied to it, provided all physical conditions and temperatures remain constant.
Ohm's Law is not a universal law. It is only applicable to ohmic conductors such as iron and copper but does not apply to non-ohmic conductors such as semiconductors. Ohm's Law does not apply to semiconducting devices because they are nonlinear devices, meaning that the ratio of voltage to current does not remain constant for variations in voltage.
Nichrome is an alloy of nickel and chromium, and sometimes iron. It is considered to be ohmic or linear because, when plotting current against voltage, it produces a straight-line graph for variations in voltage. Thus, nichrome obeys Ohm's Law.
However, there are far more non-linear conductors than linear ones. For example, if we were to use tungsten, as the voltage applied to it increases, it gets hotter, and its resistance increases, resulting in a curved graph. This indicates a lack of proportionality, and so Ohm's Law does not apply.
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Frequently asked questions
Yes, nichrome is considered to be 'ohmic' or 'linear' because it produces a straight-line graph when plotting current against voltage. Nichrome has a constant resistance and therefore obeys Ohm's Law.
Nichrome is an alloy of nickel and chromium, and sometimes iron. It has a high melting point of around 1400 degrees Celsius and is a good conductor of electricity. Nichrome is often used as a heating element due to its high resistance, which means that resistors with the required resistance and power ratings can be produced with relatively small amounts of wire.
Nichrome exhibits a linear relationship between voltage and current, meaning that as voltage increases, current also increases proportionally. This is in contrast to non-ohmic materials, such as semiconductors, where the relationship between voltage and current is nonlinear.
