Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 549 · 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 DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
3. 3.🦾 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 right (b) points up and left (c) points straight up (d) points left
4. 4.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
5. 5.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
6. 6.🦾 A servo program runs:
   angle = 80
   angle = angle − 60
   angle = angle + 60
   angle = angle − 40
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo program runs:
   angle = 100
   angle = angle + 40
   angle = angle + 30
   angle = angle + 10
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
9. 9.🦾 A servo moves from 170° to 0°. How many degrees does it turn?
10. 10.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
11. 11.🦾 A servo moves from 80° to 20°. How many degrees does it turn?
12. 12.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
13. 13.🦾 A servo moves from 90° to 110°. How many degrees does it turn?
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
18. 18.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
19. 19.🦾 A servo moves from 10° to 150°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle + 30
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo moves from 10° to 100°. How many degrees does it turn?
25. 25.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
26. 26.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
30. 30.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
32. 32.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo moves from 20° to 120°. How many degrees does it turn?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle + 10
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
39. 39.🦾 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 left (b) points up and left (c) points straight up (d) points up and right
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

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