What is variable resistor use for?
Variable resistors are widely used in electric circuits to adjust the value of current or voltage, since the resistance of variable resistors can be set to a certain value. Variable resistors allow you to adjust the value of voltage by changing the resistance and keeping current constant .
What is the difference between potentiometer and variable resistor?
A variable resistor is a resistor of which the electric resistance value can be adjusted. When a variable resistor is used as a potential divider by using 3 terminals it is called a potentiometer. When only two terminals are used, it functions as a variable resistance and is called a rheostat.
What is the value of variable resistor?
The rating or “resistive” value of a potentiometer or variable resistor relates to the resistive value of the entire stationary resistance track from one fixed terminal to the other. So a potentiometer with a rating of 1kΩ will have a resistive track equal to the value of a 1kΩ fixed resistor.
What is the function of R1 variable resistor?
R1 is the resistor closest to the input voltage, R2 is the resistor closest to ground, Vin is the input voltage, and Vout is the output voltage. Potentiometers are basically just adjustable voltage dividers.
What is a variable resistor GCSE?
A variable resistor can be used to control the current passing through a circuit. If the potential difference is constant then the current decreases as the resistance of the variable resistor increases. A variable resistor can be used to control the potential difference of another component in series with it.
What kind of resistor is a 20 watt wire wound?
OHMITE B20J100K Wirewound Tubular Resistor. 100000 ohms, 20 watt. Brown Devil 200 Series. High power resistor. Higher temperature rugged vitreous enamel coating. Flame resistant. All welded construction.:
What is the wattage of a rw20v1r5 resistor?
OHMITE RW20V1R5 Wirewound Resistor. Resistance: 1.5 Ohm Wattage: 20 W Tolerance: 5%: RW20V1R5 OHMITE B20J1R0 Wirewound Tubular Resistor. 1 ohms, 20 watt. Brown Devil 200 Series.
What is the wattage of a 20K ohm resistor?
Fixed vitreous type. 20 kOhm ohms, 20 Watt, 5% tolerance.: 2HJ20K OHMITE B20J15K Wirewound Tubular Resistor. 15000 ohms, 20 watt.
How many watts is a b20j2k75 wirewound resistor?
Flame resistant. All welded construction.: B20J2K75 OHMITE B20J2K5 Wirewound Tubular Resistor. 2500 ohms, 20 watt. Brown Devil 200 Series. High power resistor. Higher temperature rugged vitreous enamel coating. Flame resistant.