Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 790 · 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 = 170
   angle = angle − 40
   angle = angle + 10
   angle = angle − 10
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
2. 2.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo moves from 170° to 40°. How many degrees does it turn?
5. 5.🦾 A servo program runs:
   angle = 20
   angle = angle − 10
   angle = angle + 50
   angle = angle + 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
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 left (c) points right (d) points straight up
8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
9. 9.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
11. 11.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle − 30
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 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 right (b) points straight up (c) points left (d) points up and right
13. 13.🦾 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 up and left (b) points right (c) points straight up (d) points up and right
14. 14.🦾 A servo moves from 130° to 30°. How many degrees does it turn?
15. 15.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 180° to 120°. How many degrees does it turn?
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
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 moves an arm joint? (a) a DC motor (b) a servo motor
20. 20.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
21. 21.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
23. 23.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
24. 24.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
29. 29.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 60
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
33. 33.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 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 up and left (b) points up and right (c) points straight up (d) points right
37. 37.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?

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