What are controlled variables give an example?

Examples of Controlled Variables Temperature is a common type of controlled variable. If a temperature is held constant during an experiment, it is controlled. Other examples of controlled variables could be an amount of light, using the same type of glassware, constant humidity, or duration of an experiment.

How does length of a wire affect resistivity?

First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. In the same manner, the wider the wire, the less resistance that there will be to the flow of electric charge.

What are the control variables of an experiment?

Essentially, a control variable is what is kept the same throughout the experiment, and it is not of primary concern in the experimental outcome. Any change in a control variable in an experiment would invalidate the correlation of dependent variables (DV) to the independent variable (IV), thus skewing the results.

What are control variables in research?

A control variable is a variable or an element which is held constant throughout an experiment or a research in order to assess the relationship between multiple variables.

How do you measure resistivity of A metal?

The resistance of a given material is proportional to the length, but inversely proportional to the cross-sectional area. Thus resistivity can be expressed using the SI unit ohm metre (Ω⋅m) — i.e. ohms divided by metres (for the length) and then multiplied by square metres (for the cross-sectional area).

How do you find the resistivity of A metal?

Calculate the resistivity using the following equation: o = l/RA. l is the length of the sample (in meters), R is the resistivity (in ohms) and A is the area of the sample (in square meters).

How does resistance change with length of wire?

The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through. The relationship between resistance and wire length is proportional .