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it use in adjusting amount of current passing through a circle.
What else can I help you with?
A device that decreases voltage?
Step down transformer, potentiometer or rheostats can all be used to reduce voltage.
What is working principle of rheostat in electric circuits?
The basic principle that rheostats use is Ohm's law, which states that current is inversely proportional to resistance for a given voltage. This means the current decreases as the resistance increases or it increases as the resistance decreases. Current enters the rheostat through one of its terminals, flows through the wire coil and contact, and exits through the other terminal. Rheostats do not have polarity and operate the same when the terminals are reversed. Three-terminal potentiometers can be used as rheostats by connecting the unused third terminal to the contact terminal.
Why rheostats have current ratings in additing to resistance rating?
So you don't try to put in more current than they can handle - so they don't catch fire.
If the rheostats are replaced by three incandescent lamps can you verify the thevenin's theorem?
Yes, if the rheostats are replaced by three incandescent lamps, you can still verify Thevenin's theorem. Thevenin's theorem states that any linear circuit can be replaced by an equivalent circuit consisting of a voltage source and a series resistor. By analyzing the behavior of the circuit with the incandescent lamps, you can determine the Thevenin equivalent circuit and verify the theorem.
What could be the possible danger if rheostates are used in parallel?
Using rheostats in parallel can lead to several dangers, including overheating and potential failure of the components. Since the resistance of each rheostat decreases with parallel configuration, the total current may exceed safe limits, causing excessive heat generation. This can result in damage to the rheostats and possibly create fire hazards. Additionally, unequal load distribution may lead to instability in the circuit.
Where a varying voltage is required this can be achieved by?
Variable resistors are called rheostats. A potentiometer can be used as a rheostat. Use the wiper terminal and one of the outside terminals for connections. The third terminal of the potentiometer is unused.
Why wouldn't copper work in a rheostat?
Copper would not be practical because of its high conductivity. The result of using copper would be that you would need to make very big rheostats to get any useful resistance.
What is the other name for rheostat?
The other name for a rheostat is a variable resistor. It is used to control current flow in a circuit by adjusting its resistance. Rheostats are often employed in applications such as dimming lights or controlling the speed of motors.
How do you select field rheostat range for dc motor?
For a shunt dc motor the rheostat would vary from zero ohms to a value that produces the required minimum field current, but rheostats are not common with shunt motors except as a crude way of controlling the speed. Series dc motors normally use rheostats for starting, especially in trams etc. because the starting torque and current is very high. The rheostat resistance starts at a value equal to the supply voltage divided by the maximum allowable current drawn, and is reduced as the speed builds up.
What determines which one of the terminal of a rheostat in positive when connected in a series?
Electron flow is from negative(-) to positive(+), the rheostat would have to be on the negative side for the device being controled, before the device, e.g. light bulb.AnswerIt doesn't matter. Rheostats don't have positive or negative terminals.
Is a resistor a linear device?
Yes, if you are talking about the normal carbon composition types having colour codes. But there are some non-linear types too.
A formula prewritten by excel is called?
Function
