Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 198 · 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.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo program runs:
   angle = 0
   angle = angle + 50
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
6. 6.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
7. 7.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
10. 10.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
11. 11.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
12. 12.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points straight up (c) points right (d) points up and right
13. 13.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points straight up (c) points up and left (d) points up and right
14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
17. 17.🦾 A servo moves from 160° to 20°. How many degrees does it turn?
18. 18.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
21. 21.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
22. 22.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
23. 23.🦾 A servo moves from 110° to 150°. How many degrees does it turn?
24. 24.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
25. 25.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
26. 26.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 60
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 right (b) points left (c) points straight up (d) points up and right
28. 28.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo moves from 130° to 40°. How many degrees does it turn?
35. 35.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
36. 36.🦾 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 left (b) points up and left (c) points up and right (d) points straight up
37. 37.🦾 A servo program runs:
    angle = 90
    angle = angle + 50
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?

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