A rheostat is a component used to regulate current in an electric circuit without changing the voltage source. It allows for the adjustment of resistance, enabling the control of current flow. This is particularly useful in practical cases where it is necessary to increase or decrease the current in a circuit without altering the overall voltage.
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A rheostat in an electric circuit serves the purpose of varying and controlling the resistance within the circuit. It is a variable resistor with an adjustable resistance value, achieved by changing the position of a sliding contact along a resistive wire. By adjusting the rheostat, the overall resistance in the circuit can be increased or decreased, affecting the current flow and voltage levels. This capability is valuable in applications where precise control over these parameters is necessary, such as dimming lights, regulating motor speed, or tuning electronic circuits. Rheostats provide a dynamic means to manipulate electrical characteristics in a controlled manner.