A resistor is an electrical element that limits or controls the flow of electrical current in an electronic circuit. Resistors can also be used to afford an exact voltage for an active device such as a transistor.
A resistor has two terminals diagonally which electricity must pass, and is designed to drop the voltage of the current as it run from one terminal to the next. A resistor is primarily used to generate and maintain a known safe current within an electrical component. Unit of resistor is Ohm’s (Ω).
Imagine water flowing through a pipe. If we make the pipe thin then this will restrict the flow of water. If we force the water (current) through the narrow gap by increasing the pressure (voltage) then energy will be given off as heat. In addition, there will be an important difference in pressure (voltage) above and below the restriction.
In electronics we use a resistor when we need to reduce the voltage applied to a circuit.
A resistor is covered with paint or enamel, or covered in molded plastic to protect it. Because resistors are often too small to be written on, a standardized color-coding system is used to identify them.
The first three colors represent ohm value, and a fourth indicates the tolerance, or how close by percentage the resistor is to its ohm value. This is important for two reasons: the nature of resistor structure is imprecise, and if used above its maximum current, the value of the resistor can change or the unit itself can burn up.
A resistor has two terminals diagonally which electricity must pass, and is designed to drop the voltage of the current as it run from one terminal to the next. A resistor is primarily used to generate and maintain a known safe current within an electrical component. Unit of resistor is Ohm’s (Ω).
Imagine water flowing through a pipe. If we make the pipe thin then this will restrict the flow of water. If we force the water (current) through the narrow gap by increasing the pressure (voltage) then energy will be given off as heat. In addition, there will be an important difference in pressure (voltage) above and below the restriction.
In electronics we use a resistor when we need to reduce the voltage applied to a circuit.
A resistor is covered with paint or enamel, or covered in molded plastic to protect it. Because resistors are often too small to be written on, a standardized color-coding system is used to identify them.
The first three colors represent ohm value, and a fourth indicates the tolerance, or how close by percentage the resistor is to its ohm value. This is important for two reasons: the nature of resistor structure is imprecise, and if used above its maximum current, the value of the resistor can change or the unit itself can burn up.
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