Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 841 · 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.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
2. 2.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
4. 4.🦾 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 straight up (b) points right (c) points up and right (d) points up and left
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
7. 7.🦾 A servo program runs:
   angle = 100
   angle = angle + 30
   angle = angle + 40
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
9. 9.🦾 A servo program runs:
   angle = 0
   angle = angle + 50
   angle = angle + 60
   angle = angle + 40
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo moves from 180° to 100°. How many degrees does it turn?
12. 12.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
13. 13.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
14. 14.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
15. 15.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
17. 17.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
23. 23.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
24. 24.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
25. 25.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
29. 29.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo moves from 100° to 170°. How many degrees does it turn?
31. 31.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
32. 32.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
34. 34.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
38. 38.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
39. 39.🦾 A servo moves from 30° to 80°. How many degrees does it turn?
40. 40.🦾 A servo moves from 170° to 50°. How many degrees does it turn?

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