RESISTOR (Ω)
The unit of resistor is ohm (Ω). The larger value of the resistor is in kilo ohms (KΩ) and In mega ohms (MΩ)
a) Carbon Resistor
b) Wire wound Resistors
Resistor is the most commonly used in electronic devices. The main function of resistors is to oppose the flow of current. Both current AC and DC are equally opposed. Resistors also provide a desired voltage drop.
SYMBOL :
The unit of resistor is ohm (Ω). The larger value of the resistor is in kilo ohms (KΩ) and In mega ohms (MΩ)
Ohms = 1
Kilo Ohms = 10 3 = 10×10×10 = 1000 ohms
Mega Ohms = 10 6 = 10×10×10×10×10×10 = 1000000 ohms
1000 ohms = 1 kilo ohms
1000 kilo ohms = 1 mega ohms
TYPE OF RESISTORS
Fixed Resistors & Variable Resistors
A) Fixed Resistor
The value of these resistor is represented by the color code printed on it. They are available in different wattage (Power) from 1/4 watt, 1/2 watt, 1watt and 2 watt. They are used in all electronic devices. The values of resistors are from ohm to mega ohms.
The value of these resistors along with wattage is printed on the body of the resistors. They are available in different colors like Red, white, green, black, brown, violet, etc. They are used in high voltage power supply. They are also called as low value high wattage resistance. They are available wattages from 2.5w, 5w, 10e, 20w and 40w etc.
2) Variable Resistors
These resistors are also called as Potentio-meter or (POT). They are used in radio, T.V. Tape-Recorders as a volume control or Tone Control. Sometimes these controls are attached with on/off Switch to control power.
Resistor's value is determined by the color code on them, to know How to calculate the resistor value click here
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