potentiometer

"The classroom divider separated the students in the two different groups. "

"The adjustable chair in the classroom allowed students to sit comfortably at different heights. "

"The amount of time it takes to finish my homework is a variable; sometimes it takes me an hour, other times it takes much longer. "

"The violinist was a master of her instrument."

"After taking the train to the airport, I walked to the terminal building. "

"The recipe calls for specific measures of flour and sugar. "

"There is still time to oppose this plan."

"During the occupation, many brave people acted as resistors, hiding refugees and sabotaging enemy supplies. "

"Be careful when opening high-voltage equipment."

"The fraction of the pie left was very small; only a tiny bit remained. "

"The clogged sink drained slowly."

"The student answered the math questions accurately. "