Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 270 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
2. 2.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo program runs:
   angle = 140
   angle = angle − 10
   angle = angle + 10
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
7. 7.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
9. 9.🦾 A servo moves from 100° to 120°. How many degrees does it turn?
10. 10.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
11. 11.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and right (b) points straight up (c) points up and left (d) points right
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo moves from 100° to 170°. How many degrees does it turn?
18. 18.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
19. 19.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
23. 23.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and left (b) points left (c) points up and right (d) points straight up
27. 27.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
28. 28.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 80° to 150°. How many degrees does it turn?
30. 30.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and right (b) points up and left (c) points right (d) points left
32. 32.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
33. 33.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
34. 34.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
35. 35.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
37. 37.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
39. 39.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?

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