# Build your own robot: Potentiometer, Capacitor

Now we can take a brief look at  the components part. The resistor is an electrical device that resists the flow of electrical current. It can break the flow of electric current so as to steady the flow of control of electric current. It is measured in ‘ohms’. Then higher the value of  ‘ohms’, the more  is the resistance and the vice versa. For the basic electronic purposes resistors having the power rating of 1/4W would be more than sufficient. To know the value of resistor there are some methods. One is  to read the color code at the value of resistance and the other is to use a multimetre. These resistors are constant resistors and do not vary automatically unless heated too much. There are some variable resistor available in the market, we will discuss about it in this article.

Potentiometer:
A measuring instrument for measuring direct current electromotive forces. A resistor with three terminals, the third being an adjustable center terminal; used to adjust voltages in radios and TV sets . Potentiometer is a resistor , which has variable resistor and can changed at will by the user. It can be very potent for the user who is unsure of the what resistant to fixed and so  the user can level the resistance with it. The rotating shaft or knob located in the body can be used to maximize and minimize the resistance by rotating it to one direction or the other.   The resistance between two extreme terminals is constant on the other hand the resistance between middle and the two extreme terminals  is variable.

Capacitor:
An electrical device characterized by its capacity to store an electric charge. A Capacitor can store electrical charges. It is measured in ‘Farads’. The capacitance of a capacitor that has an equal and opposite charge of 1 coulomb on each plate and a voltage difference of 1 volt between the plates. So, the storing capacity of capacitor is measured with the ‘Farads’ rating. To know the capacitance of capacitor we use ‘microfarads’ is the smaller unit used to measure the capacitor. Generally the capacitors are of two types: Polar capacitor and the Non Polar capacitor.

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Modified: 26th Feb 2015