All of the following statements are true EXCEPT:
A. variable resistors, called rheostats or potentiometers, are also used to control the speed and intensity of electrical loads.
B. a rheostat varies current flow through the circuit as a movable wiper runs along a resistor.
C. a potentiometer varies the voltage in a circuit.
D. a variable resistor is commonly called a "volt," whether it is a potentiometer or a rheostat.
Answer: D
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