Calculating Temperature of Liquid with Electrical Energy

In summary, the conversation is about a platinum wire being used to heat a liquid and its resistance changing over time. The formula R2 = R1 [ 1 + a(▲ t)] is mentioned and the person is having difficulty solving for the temperature (x) in the equation. They are also advised to confirm the temperature unit and use reference materials or online resources to find the resistivity of platinum at different temperatures.
  • #1
noypihenyo
3
0
A platinum wire having a resistance 4.85 ohms at 20degree C
is used to heat a liquid. the resistance of wire 5.97ohms after a cetain time. Determine the temperature of the liquid.


please help me to answer this.
 
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  • #2
Looks like you need to find out the resistivity of platinum versus temperature. What does a google search tell you? What are likely websites that you could go to to find that info? Or if you're old like me, what reference book would you pull down off the bookshelf to look it up?
 
  • #3
this is the formula


R2 = R1 [ 1 + a(▲ t)] = 5.97ohms

the equation look loke this?

R2 = 4.85 [ 1 + .0038(20-x)] = 5.97ohms

i have some difficulties to find the value of x
 
  • #4
First, double-check whether the temperature is supposed to be in C or K (absolute temp). Second, are you saying that you are having trouble with the algebra, or some other part of the equation?
 

1. How do you calculate the temperature of a liquid using electrical energy?

To calculate the temperature of a liquid using electrical energy, you would need to know the specific heat capacity of the liquid, the amount of electrical energy transferred, and the mass of the liquid. You can then use the formula Q = mcΔT, where Q is the amount of energy transferred, m is the mass of the liquid, c is the specific heat capacity, and ΔT is the change in temperature.

2. What is specific heat capacity and why is it important in calculating temperature with electrical energy?

Specific heat capacity is the amount of energy required to raise the temperature of 1 gram of a substance by 1 degree Celsius. It is important in calculating temperature with electrical energy because it helps determine how much energy is needed to increase the temperature of a specific amount of liquid.

3. How does the type of liquid affect the calculation of temperature using electrical energy?

The type of liquid does affect the calculation of temperature using electrical energy because different liquids have different specific heat capacities. This means that the amount of energy needed to raise the temperature of different liquids will vary, even if the other variables (mass and energy transferred) are the same.

4. Is there a limit to how much the temperature of a liquid can increase using electrical energy?

Yes, there is a limit to how much the temperature of a liquid can increase using electrical energy. This is because some of the energy is lost as heat to the surroundings, and there is also a limit to how much energy a liquid can absorb before reaching its boiling point.

5. How can I accurately measure the temperature of a liquid when using electrical energy?

To accurately measure the temperature of a liquid when using electrical energy, you can use a thermometer specifically designed for liquids. It is important to ensure that the thermometer is calibrated correctly and that it is placed in the liquid before the electrical energy is transferred. This will give you the most accurate measurement of the liquid's temperature.

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