A science project requires a variable resistor to adjust the current in a circuit. Which symbol should be used in the schematic diagram to represent this component?
A zigzag line with an arrow across it
In circuit diagrams, a fixed resistor is represented by a simple zigzag line, since its resistance value does not change.
A variable resistor, also called a rheostat, is used to adjust resistance and hence current in a circuit, and its symbol needs to indicate this adjustability.
This is shown by adding a diagonal arrow across the zigzag line, representing the sliding contact that can be moved to change the resistance value.
Hence, a zigzag line with an arrow across it is the correct schematic symbol for a variable resistor.
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