What is the correct name and function of the device represented by the given symbol?
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A.
Ammeter; used for measuring current flowing through a circuit.
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B.
Rheostat; used for varying the current flowing through a circuit.
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C.
Switch; used for connecting and disconnecting the circuit.
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D.
Battery; used for providing potential difference.
Correct Answer:
B. Rheostat; used for varying the current flowing through a circuit.
Explanation:
The device shown in the symbol is a rheostat, which is a variable resistor used to control the flow of electric current by manually increasing or decreasing resistance. By adjusting the rheostat, one can regulate the current levels within a circuit without changing the voltage source. Unlike a fixed resistor or a simple switch, it provides a range of resistance values to fine-tune the circuit's performance. Other components like ammeters measure current, switches control the connection, and batteries serve as the power source, making the rheostat the specific tool for current variation.
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