What Are the Correct Units for p in the Equation R=pl/A?

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In summary, the units of p can be found by looking at the equation or context in which p is used, and can vary depending on the specific context. Finding the units of p is important for understanding its physical meaning and for converting between different units. Some common units associated with p include meters per second, newtons, and pascals, but the units can vary. The units of p can also be determined experimentally through scientific research and experimentation.
  • #1
phyuk2
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Homework Statement



rearrange to make p the subject then work out the units for p

R - resistance or wire
A - area in m2
l - length

Homework Equations



R=pl/A


The Attempt at a Solution



p = AR/l

(m2 x m2kgS-3A-2)/m

Resistance is ohms which is m2kgS-3A-2 I think.

p=m3kgS-3A-2
 
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  • #2
Yes, your working is right. The units for resistivity is the ohm.metre or m3kgs-3A-2
 
  • #3



Your attempt at a solution is mostly correct. However, the units for p should be m2kgS-3A-2, as you have already correctly identified that resistance is measured in ohms, which has the same units as m2kgS-3A-2. The final unit for p would be m2kgS-3A-2, which can also be written as ohms per meter (Ω/m). This means that p represents the resistance per unit length of the wire.
 

Related to What Are the Correct Units for p in the Equation R=pl/A?

1. How do you find the units of p?

The units of p can be found by looking at the equation or context in which p is used. If p is a physical quantity, it will have units associated with it that can be determined through dimensional analysis.

2. Can the units of p vary?

Yes, the units of p can vary depending on the context in which it is being used. For example, p can represent pressure, momentum, or probability, each with their own respective units.

3. What is the significance of finding the units of p?

Finding the units of p is important because it allows us to understand the physical meaning and magnitude of the quantity. It also allows us to convert between different units and use p in various equations and calculations.

4. Are there any common units associated with p?

Yes, there are some common units associated with p such as meters per second (m/s), newtons (N), and pascals (Pa). However, the units of p can vary depending on the specific context in which it is used.

5. Can the units of p be determined experimentally?

Yes, the units of p can be determined experimentally by measuring the physical quantity that p represents and analyzing the units of the measurement. This is often done in scientific research and experimentation.

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