Heat and electric current

In summary, heat is a form of energy that is transferred due to a difference in temperature, while electric current is the flow of electric charge through a material. Heat and electric current are related as heat can be produced by the flow of electric current through a conductor, and they are measured in joules and amperes respectively. Heat can also affect the flow of electric current through the temperature coefficient of resistance, and heat can be converted into electric current through thermoelectric devices.
  • #1
AdnamaLeigh
42
0
A 111 V electric iron draws 8.9 A of current. How much heat is developed per hour? Answer in units of J.

P = IV
P = U/t
U = IVt
U = 8.9(111)(60) = 59274 J

Apparently I'm wrong and I don't know why.
 
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  • #2
A = (C/s)

You have 60 mins, your units have a missmatch.
 
  • #3


Your calculation is correct. The heat developed per hour can be calculated using the formula Q = Pt, where Q is the heat, P is the power, and t is the time. In this case, the power is 59274 J/hour, so the heat developed per hour is also 59274 J. It is possible that the question was asking for the heat in a different unit, such as calories or BTUs, which would require a conversion. Otherwise, your answer is correct.
 

1. What is the difference between heat and electric current?

Heat is a form of energy that is transferred from one object to another due to a difference in temperature. Electric current, on the other hand, is the flow of electric charge through a conducting material.

2. How are heat and electric current related?

Heat can be produced by the flow of electric current through a conductor, as the resistance of the material causes it to heat up. This is known as Joule heating or resistive heating.

3. What is the unit of measurement for heat and electric current?

Heat is typically measured in joules (J) or calories (cal), while electric current is measured in amperes (A) or coulombs per second (C/s).

4. How does heat affect the flow of electric current?

Heat can increase the resistance of a material, which can in turn decrease the flow of electric current through it. This is known as the temperature coefficient of resistance.

5. Can heat be converted into electric current?

Yes, heat can be converted into electric current through thermoelectric devices. These devices use the temperature difference between two materials to generate a voltage and produce electric current.

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