A variable resistor is a resistor of which the electric resistance value can be adjusted. A variable resistor is in essence an electro-mechanical transducer and normally works by sliding a contact (wiper) over a resistive element.
What is a variable resistor used for?
A variable resistor is used in some dimmer switches and volume controls. The resistance of a thermistor depends on its temperature. At low temperatures, the thermistor has a high resistance. As the temperature increases, the resistance decreases.
What is the symbol of a rheostat?
The symbol of rheostat is the same as a normal resistor symbol including an arrow. This arrow indicates the movable wiper or variable resistance.
What is a resistor with variable resistance?
An electronic component that is used to vary the amount of current that flows through a circuit. It works by sliding a wiper terminal across a resistive material, typically a thin film or chunk of carbon or a resistive wire made of nickel chromium or tungsten alloys.
How do you find the variable resistor?
We find then that the resistance of our variable resistor equals the overall circuit resistance minus the resistance of the galvanometer minus the resistance of the fixed resistor.
What is the function of R1 variable resistor?
To calculate the output voltage of a voltage divider, use the Voltage Divider Equation below: 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 cell symbol?
The symbol for a cell has two parallel lines at right angles to the connecting wires. The thinner line marks the positive terminal of the cell and the thicker, shorter, line marks the negative terminal. A battery (more than one cell) is drawn as a series of cells, each usually adding 1.5 volts.
Why does a variable resistor have 3 pins?
To use the potentiometer as a voltage divider, all the three pins are connected. One of the outer pins is connected to the GND, the other to Vcc and the middle pin is the voltage output. Basically, the voltage divider is used to turn a large voltage into a smaller one.
What is a transformer symbol?
While the schematic symbol of a transformer may look like two coils (called windings) placed next to each other, the magnetic coupling and orientation between these two coils is also indicated within its schematic symbol.
What is a resistor symbol?
The value of a resistor is measured in ohms and represented by the Greek letter capital omega (Ω). The resistance value is specified in ohms, the standard symbol is “R” or Ω. Resistor values are often stated as “k” (kilo, or times 1,000) or “M“, (meg, or times 1,000,000) for convenience.
What is the ammeter symbol?
Ammeters are typically represented by a circle with a letter A inside (Figure 1). Figure 1. Symbol for ammeter. Voltmeters are typically represented by a circle with a letter V inside (Figure 2).
What is a variable resistor Class 10?
Variable Resistance: The component of an electric circuit which is used to regulate the current, without changing the voltage from the source; is called variable resistance. Rheostat: This is a device which is used in a circuit to provide variable resistance.
What is load resistor and variable resistor?
Variable Load resistor:
It comes with various wattage ratings from 5 Watts to 100 Watts and so on. It is also called as a potentiometer. Generally, a variable load resistor is used to test the effect of Load resistance on the power consumed by the circuit and several other parameters.
Are variable resistors ohmic?
As a variable resistor’s resistance can be changed, we can therefore change the current in the circuit. This will be according to Ohms Law, as a simple resistor is a Ohmic Conductor.
