Scroll down to related links and look at "Symbols for a resistor".
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Use the standard resistor symbol and then place an arrow across the resistor. The bottom of the arrow midpoint of the resistor and just below, the tip of the arrow (draw with an arrow head) just above the resistor. This represents the wiper of the variable resistor.
A resistor.
A series dropping resistor is a resistor that limits the amount of current flow in a circuit.
because without using capacitor or resistor in a circuit,it cant be complete.Resistor is used to protect the circuit by giving a certain amount of voltage.Capacitor is used to charge and discharge purpose.
Put the resistor symbol ie zig zag. Then put a crossing line with arrow headed at the top.