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A variable resistor is used in cicuits to vary the current passing through the resistor. It is commonly used to change the value of current across a circuit, or to act as a voltage divider.
They are commonly equiped with a knob outside of a cabinet, to enable the user to adjust the operation of a circuit, like a volume control on a radio or amplifier.
Sabina Lindgren
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What is the use of void pointer?
Void Pointer is a General purpose pointer ,that does not have any data type associated with it and can store address of any type of variable. Declaration: void * pointer_name;
Is D a good variable name?
Variable names should show what data the variable holds so others reading your code will understand it. For example, a variable holding the age of a user should be called "age" or "user_age", or something similar.
How does a technological system adjust itself?
it haves a sstem of parts
What do the percent signs in SystemRoot represent?
Substituting environment variable valuesTo enable the substitution of variable values at the command line or in scripts, enclose the variable name in percent signs (that is, %variablename%). By using percent signs, you ensure that Cmd.exe references the variable values instead of making a literal comparison. After you define variable values for a variable name, enclose the variable name in percent signs. Cmd.exe searches for all instances of the variable name and replaces it with the defined variable value. For example, if you create a script that contains different values (for example, user names) and you want to define the USERNAME environment variable for each user with these values, you can write one script using the variable USERNAME enclosed in percent signs. When you run this script, Cmd.exe replaces %USERNAME% with the variable values, which eliminates the need to perform this task manually for each user. Variable substitution is not recursive. Cmd.exe checks variables once. For more information about variable substitution, see For and CallFrom the above Technet description, the % signs are used to ensure that "cmd.exe" does not literally use the term "systemroot" and references the systemroot variable correctly (So therefore %systemroot% is recognised correctly as the C:\ drive, if C:\ is your systemroot).
A constant that multiplies a variable?
A constant that multiplies a variable is no longer a constant. By its very definition, a constant is something that can never be different. The result of variable multiplication is thus a variable, not a constant.I would say that the above answer is not necessarily true. The common equation for the area of a circle is: area = pi * r2The fact that you are multiplying the mathematical constant pi by a variable does not change the value of pi.Agree with the second answer. Jsut to add, a constant that multplies a variable is called a coefficient.
What is an idependent variable?
It is the kind of variable that you purposely change.
What is the dependent varible?
The dependent variable ( responding variable ) is the variable that changes on purpose.
Which variable is changed on purpose?
constant
Does manipulated variable mean changed on accident?
A manipulated variable is not changed on purpose.
What you change on purpose in the experiment?
independent variable
The variable not related to the purpose of th study but may affect the dependent variable are termed as extraneous variable true or false?
False: they are called exogenous.
What is the purpose of initialising an array?
Arrays are variables, so your question is: What is the purpose of initialising a variable? Answer: assigning initial values to them.
When solving by the substitution method what happens when one variable cancels out?
That's exactly the purpose of the substitution method ... to get an equation with one less variable. When you have it, you solve it for the variable that's left.
What is the purpose of set-up A?
So you can make sure the results you gain are only due to the independent variable and not a variable not being tested.
Is an independent variable defined to be a variable that is to be predicted or estimated?
neither, an independent variable is a variable not being changed in the process of a science experiment. A variable in math cannot be described, only purpose of a variable is to take place of a number that you are trying to figure out in some equations. Others are equations with no solution.
A variable that changes as a result of the other variable?
The dependent variable.
What is the purpose of the control set up?
So you can make sure the results you gain are only due to the independent variable and not a variable not being tested.
