MOSFET resistors are a type of resistor that use Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) technology to provide precise and stable resistance values. They are commonly used in electronic circuits where high accuracy and stability are required, such as in precision voltage dividers, current sensing circuits, and feedback networks. MOSFET resistors offer advantages such as low temperature coefficient, high linearity, and low noise, making them suitable for a wide range of applications in electronics. **

SMD resistors come in a variety of sizes and packages, including 0402, 0603, 0805, 1206, and larger. The specific size of SMD resistor that will fit depends on the footprint and design of the circuit board. It's important to consult the datasheet and specifications of the circuit board or component to determine the appropriate size of SMD resistor to use. Generally, smaller SMD resistors like 0402 and 0603 are commonly used in compact electronic devices, while larger sizes like 0805 and 1206 are used in applications where space is less constrained. **

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Resistors can be purchased from a variety of places, including electronics stores, online retailers such as Amazon or Digi-Key, and specialty electronics component stores. Many hardware stores also carry a selection of basic resistors. Additionally, hobbyist and maker spaces may have resistors available for purchase. **

Resistors can be combined in series or parallel. When resistors are connected in series, their resistances add up, meaning the total resistance is the sum of the individual resistances. When resistors are connected in parallel, their total resistance is less than the resistance of the smallest individual resistor. This is because the current has multiple paths to flow through, reducing the overall resistance. These combinations can be used to create specific resistance values for different applications. **

Resistors can be purchased from a variety of places, including electronic component stores, online retailers such as Digi-Key, Mouser, and Amazon, as well as local hardware stores that carry electronic components. Additionally, specialized electronics shops and hobbyist stores may also stock resistors in various values and wattages. It is important to ensure that you are purchasing the correct type and value of resistor for your specific project or application. **

There could be several reasons why your resistors are not getting hot. One possibility is that the current passing through the resistors is lower than their power rating, so they are not generating enough heat to become hot. Another reason could be that the resistors are not properly connected in the circuit, leading to a lack of current flow. Additionally, the resistors may be of a higher power rating than necessary for the circuit, resulting in them not getting hot. It's important to double-check the circuit connections and the specifications of the resistors to ensure they are being used correctly. **

There are several differences between resistors, including their resistance value, power rating, and tolerance. Resistance value refers to the amount of opposition a resistor provides to the flow of electric current, and is measured in ohms. Power rating indicates the maximum amount of power a resistor can dissipate without being damaged. Tolerance refers to the range within which the actual resistance of a resistor may vary from its specified value. Additionally, resistors can differ in their physical size, shape, and construction materials, which can affect their performance and suitability for specific applications. **