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Depending on the situation. The purpose of the rheostat is use to change the resistance of the circuit.
The rheostat is use to define Ohm Laws
the 2nd situation is use to find out what the fixed resistor's resistance.
3rd purpose : used to control the resistance of circuit.
eg Radio
Wiki User
∙ 16y ago
Wiki User
∙ 9y agoA rheostat is an adjustable resistor mainly used in controlling the electrical resistance of a circuit. It is a component in appliances and other devices that need both high voltage and electrical current that can be interrupted.
Wiki User
∙ 6y agoTo control the value of resistance in the circuit.
e.g. In a simple circuit consisting of a cell/battery/power supply, a bulb and a rheostat, the more resistance you add with the rheostat gives a dimmer bulb, whereas you can decrease the resistance and resulting in a brighter bulb.
Another Answer
Variable resistors have three connections: one at opposite ends, and the other connected the 'wiper'.
Variable resistors can be used as rheostats or potentiometers. 'Rheostat' and 'potentiometer' are the names we give to how variable resistors are used; they are not the names given to the device itself.
A rheostat is a variable resistor used to control current. To do this, it is connected in series with the load, and the connection is made between one of the outer terminals and the wiper terminal.
A potentiometer is a variable resistor used to control voltage across a load. To do this, the supply voltage is connected between the two outer terminals, and the load is connected between one of the outer terminals and the wiper terminal.
Wiki User
∙ 11y agoA rheostat is an application, rather than a device. When a variable resistor is used to control current, it's called a 'rheostat'; when it's used to control voltage, it's termed a 'potentiometer'.
Wiki User
∙ 11y agoEasy to set up
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Can a rheostat be used to control speed on a capacitor run motor?
No. If you attempt to reduce the voltage to a cap start motor by using a rheostat, you can destroy the motor.
What is the rheostat?
It is a variable resistance device which control the flow of current
What is the name used for a high power variable resistor?
Rheostat
What is role of rheostat?
A rheostat is a resistor with variable resistance.There are many type of rheostat,involved of a rotary-type rheostat and a sliding rheostst.I dunn know much about the rotary-type rheostat but I can tell u how does a sliding rheostat work. A sliding rheostst consists of a coil resistance wire wound on a tube and a sliding contact.The sliding contact be moved on the metal bar.Consider of the length of the resistance wire which let electric current through increases,the reistance would be higher and decrease the elctric current.Thus by moving the sliding contact,we can adjust the size of electric current.It's ofter used as a dimmer or to adjustl the voluime of the radio. If you are interested in the rotary-type rheostat,try to find it by yourself!
In a DC circuit is there an alternate to rheostat for controlling the battery voltage?
In a DC circuit, one alternate to the rheostat for controlling battery voltage is a voltage regulator. You could build a linear regulator, but you need to consider the power that might be dissipated - this would be the same amount of power dissipated by the rheostat. You could also build a switching regulator - this would be more complex, but it could be more efficient because the dissipation across the regulator would be less.
How is a rheostat use as a potential divider?
_____________ J| -_____/\/\/\/\_________+ | | | - + | |___i|i|___| E Well this is the circuit diagram , where r is the sliding jockey of the rheostat and a cell (E) is connected in parallel with the rheostat. By adjusting the jockey resistance of the rheostat can be altered which in turn would regulate the potential offered by the cell E to the main circuit. And thus a rheostat can be used as a potential divider.
Can you use a rheostat on ac motor?
Yes you can use a rheostat to control the speed of an ac motor as long as it is correctly sized (power). A better way would be to use a triac control.
How do you Test a rheostat?
how to test a rheostat?
How do you use 12 volt battery on 6volt coil?
Use a rheostat to lower the voltage to six volts
Can you use a rheostat on fluorescent lights?
Yes, However not all fluorescent lights are capable of doing so. Check your local store to see which ones are usable with a rheostat and which ones aren't
Where does lost energy in a rheostat go?
It is lost in heating the resistive material of the rheostat.
What is the difference between a variac and a rheostat?
These devices could, in theory, be interchangeable. Variac is a (typically single coiled) variable transformer, whereas rheostat is a variable resistor. Although they may look just the same, they differ in one aspect - wire resistance. It should be as low as possible for variac, but it can differ on rheostats. So-you can use wire rheostat as a low efficiency variac and you can use wire variac as ridiculously huge rheostat, resistive range of which serves no practical purpose.
Explain the rheostat and its advantages in electric circuits?
Advantages in electric circuits : Advantages of using the rheostat in electric circuits is optional as you could just use the dial on the power-supply to vary the voltage (p.d.), and therefore the current. The advantage of using the rheostat is that you can control it to give you nice even numbers for the voltage.
How do you install a rheostat in 1999 626 Mazda?
How do you install a rheostat in 1999 626 Mazda?
How do you take out the light rheostat on a 95 Monte Carlo?
How do you take a rheostat out of a 2003 monte carlo
What is the purpose of a rheostat in the determination of an unknown resistor?
In a bridge circuit the unknown resistor is compared to the rheostat. When the meter across the bridge reads in the middle the unknown and the rheostat are the same value.
How a rheostat is used is as a potential divider?
_____________ J| -_____/\/\/\/\_________+ | | | - + | |___i|i|___| E Well this is the circuit diagram , where r is the sliding jockey of the rheostat and a cell (E) is connected in parallel with the rheostat. By adjusting the jockey resistance of the rheostat can be altered which in turn would regulate the potential offered by the cell E to the main circuit. And thus a rheostat can be used as a potential divider.
