Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 288 · 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 moves from 20° to 180°. How many degrees does it turn?
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
5. 5.🦾 A servo program runs:
   angle = 70
   angle = angle − 30
   angle = angle + 50
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo program runs:
   angle = 140
   angle = angle − 20
   angle = angle − 60
   angle = angle − 30
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
8. 8.🦾 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 left (b) points up and right (c) points right (d) points straight up
9. 9.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
10. 10.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
11. 11.⚙️ 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
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
13. 13.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
14. 14.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
19. 19.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 20
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo moves from 10° to 60°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
28. 28.🦾 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 straight up (d) points right
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
30. 30.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
31. 31.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
35. 35.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
36. 36.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
38. 38.🦾 A servo moves from 20° to 100°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False

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