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If the current increases what happens to resistance?
An increase in current will only affect resistance if it causes the temperature of the conductor to change. For pure metallic conductors, and increase in temperature will cause an increase in resistance.
Graphite resistor is with a 10 ohm iron resistor at 20 C How large should the resistance be to be temperature independent?
To achieve temperature-independent resistance, the temperature coefficient of resistance of the material should be zero. In practice, this can be challenging, but one approach is to use a combination of materials or resistors that have opposing temperature coefficients. For a graphite resistor with a 10-ohm iron resistor at 20°C, you would need to find a specific material or design that balances the temperature changes of both components to maintain the resistance at 10 ohms across varying temperatures. The exact resistance value required will depend on the specific coefficients of the materials used.
How are currents calculated?
Ohm's Law says I = V/R. You need to know the voltage across the component and its resistance, for that particular temperature and time, in order to calculate the current in the component at that instance.
What are the difficulties in high resistance measurements?
High resistance measurements can be challenging due to several factors, including noise and interference from external sources, which can significantly impact accuracy. Additionally, the contact resistance at the junctions between the measurement probes and the material being tested can introduce errors. The need for high voltage to drive a measurable current can also lead to dielectric breakdown in materials or components. Finally, maintaining stable environmental conditions, such as temperature and humidity, is crucial, as these factors can affect resistance readings.
What will be Heat developed in current carrying carrying conductor?
Any conductor has resistance. Maybe not much, but there's always some.Any resistance dissipates power, at the rate of I2R. (I = current through it, R = its resistance.)That's how you build toasters.
If the current increases what happens to resistance?
An increase in current will only affect resistance if it causes the temperature of the conductor to change. For pure metallic conductors, and increase in temperature will cause an increase in resistance.
What is 2.561 K equals how many ohms?
To convert temperature to resistance, you will need to know the specific material's temperature coefficient of resistance. This coefficient determines how much a material's resistance changes per degree temperature change. Without this information, it is not possible to accurately convert temperature to resistance.
Suppose a wire whose resistance is 2.5and 1.0 Amp of current for 1 second raises its temperature by 100 C What is the amount of current required to raise the temperature 100 C in 0.5 seconds?
If the wire's resistance is 2.5Ω and 1.0A of current for 1 second raises its temperature by 100°C, then the power dissipated is 2.5W. To raise the temperature by 100°C in 0.5 seconds, you would need to double the power output, which means you would need 2.0A of current.
Graphite resistor is with a 10 ohm iron resistor at 20 C How large should the resistance be to be temperature independent?
To achieve temperature-independent resistance, the temperature coefficient of resistance of the material should be zero. In practice, this can be challenging, but one approach is to use a combination of materials or resistors that have opposing temperature coefficients. For a graphite resistor with a 10-ohm iron resistor at 20°C, you would need to find a specific material or design that balances the temperature changes of both components to maintain the resistance at 10 ohms across varying temperatures. The exact resistance value required will depend on the specific coefficients of the materials used.
Does temperature effect a disposable camera?
Yes, you will need to keep it above freezing and below 100 degrees F.
What is the difference between thermocouple and RTD?
A thermocouple measures temperature difference between two points, producing a tiny voltage corresponding to the difference in temperature. To measure temperature with a thermocouple, you need to know the temperature of one junction and calculate the difference from the table or equation for the type of t/c used. An RTD changes resistance in response to temperature--to measure temperature with an RTD you measure its resistance (usually by putting a known voltage across it and measuring the current).
How long does pottery need in the kiln?
There is really no set time on how long pottery need in the kiln. You just it to be at a certain temperature to get the effect like having it on low temperature to melt your glaze and some has to be on high to melt.
What quantities are needed to calculate an object's resistance?
To calculate an object's resistance, you would need to know the material's resistivity, its length, cross-sectional area, and temperature (if it's a variable). Using these values, you can apply the formula R = ρ * (L/A) to calculate the resistance, where R is resistance, ρ is resistivity, L is length, and A is cross-sectional area.
Investigate the relationship between the size of the electric current passing through a length of wire and its heating effect?
The relationship between size of current in a wire and its heating effect is very simple :- Heating is proportional to the square of the current. The actual heating depends also on the resistance of the wire. W=I2R ( I is current in Amps, R is resistance in Ohms , W is heat output in Watts. ) (Note: The Watt is strictly unit of power. That is to say the rate that energy is transfered or used at. The Joule is a unit of energy equivalent to roughly the amount of mechanical work done when a 1kg mass is lifted 9.8cm. The Watt is the number of Joules expended per second.) For AC current this relationship gives an instantaneous value for the power. To get the average power you need to use the RMS value. (Peak value divided by the square root of two.) The above relationship holds true for all cases, but the wires resistance will change with temperature. In practice this means the equation must be applied for the wire in thermal equilibrium with it's environment. IE when the rate of heat output equals the rate of energy input. That is, it's working temperature. The way a material changes resistance with temperature can be quite complex and depends on the material, but for metals the resistance increases linearly with temperature. How much is given by the temperature coefficient of electrical resistance for the particular metal. This gives the amount that the resistance changes proportional to the change in temperature as a fraction of the original resistance.AnswerIt's work, not heat, that's proportional to the square of the current passing through a resistance. The amount of heat depends on the temperature difference between the resistance and the surrounding atmosphere.
Will you need sunglasses on mercury?
Yes - very thick ones! You would also need an oxygen tank, a pressure suit a life support system - made with materials that are high in temperature resistance.
How To Choose Enamel Pigments?
In the current fierce market competition, the appearance of enamel products is also an important part of product competitiveness, especially for daily enamel products. In terms of color selection, chromium oxide green, cadmium selenium sulfide (cadmium red), cadmium sulfide (cadmium yellow), melanin, etc. are all commonly used enamel pigments, so for enamel manufacturers, when purchasing enamel pigments, you need to pay attention What technical parameters? Chromium oxide (chrome green): The chrome green in the enamel pigment requires a Cr2O3 content of ≥97%, all of which pass 200 mesh, and have acid and alkali resistance. Selenium cadmium sulfide / cadmium sulfide selenide (cadmium red): The cadmium red pigment needs to have light resistance and atmospheric resistance, temperature resistance above 600 ℃, and all pass 200 mesh. Cadmium sulfide (cadmium yellow): The appearance of cadmium yellow pigment is light yellow or orange powder. Milk yellow pigment: It needs to have light resistance and atmospheric resistance, temperature resistance above 600 ℃, and all pass 200 mesh. Pink pigment: Appearance is pink powder, no water-soluble salt, light resistance and resistance to atmospheric influence, temperature resistance above 600 ℃, all pass 200 mesh. Coffee pigment: no water-soluble salt, with light resistance and atmospheric resistance, temperature resistance above 600 ℃, all through 200 mesh. Sky blue pigment: It needs to have light resistance and atmospheric resistance, temperature resistance above 600 ℃, and all pass 200 mesh. Melanin: no water-soluble salts, with light resistance and atmospheric resistance, temperature resistance above 600 ℃, all through 200 mesh. When enamel manufacturers buy enamel pigments, they need to check the color of the products. The effect of adding enamel pigments to the enamel base glaze should be basically the same as the standard sample brand to avoid color difference.
What is the correct way to check a coolant temperature sensor?
To check a coolant temperature sensor, first, ensure the engine is off and cool. Disconnect the sensor's electrical connector, and use a multimeter to measure the resistance across the sensor terminals; compare this reading to the manufacturer's specifications for temperature vs. resistance. Additionally, you can test the sensor at different temperatures by submerging it in water at various temperatures and checking if the resistance changes accordingly. If the readings are out of spec, the sensor may need to be replaced.
