Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 158 · 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 90°?
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
3. 3.🦾 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 left (c) points right (d) points straight up
4. 4.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
6. 6.🦾 A servo program runs:
   angle = 10
   angle = angle + 40
   angle = angle − 40
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
8. 8.🦾 A servo moves from 180° to 60°. How many degrees does it turn?
9. 9.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
10. 10.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
13. 13.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo 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 30°?
19. 19.🦾 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 straight up (b) points up and left (c) points up and right (d) points left
20. 20.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
21. 21.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle + 20
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
24. 24.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
25. 25.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
27. 27.🦾 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 up and right (d) points up and left
28. 28.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 160° to 20°. How many degrees does it turn?
30. 30.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
33. 33.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
35. 35.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
38. 38.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
39. 39.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 50
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 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 up and left (c) points straight up (d) points up and right

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