Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 25 · 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 program runs:
   angle = 180
   angle = angle − 10
   angle = angle − 50
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 A servo program runs:
   angle = 0
   angle = angle + 50
   angle = angle − 20
   angle = angle + 60
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
4. 4.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
5. 5.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
6. 6.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
7. 7.🦾 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 left (b) points straight up (c) points left (d) points right
8. 8.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
11. 11.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
12. 12.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
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 moves from 110° to 60°. How many degrees does it turn?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.🦾 A servo moves from 60° to 0°. How many degrees does it turn?
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
18. 18.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ 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
22. 22.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
23. 23.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
24. 24.🦾 A servo moves from 80° to 160°. How many degrees does it turn?
25. 25.🦾 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
26. 26.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 20
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
29. 29.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
33. 33.🦾 A servo program runs:
    angle = 120
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
35. 35.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
39. 39.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
40. 40.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor

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