Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 781 · 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 60° to 120°. How many degrees does it turn?
2. 2.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
3. 3.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
7. 7.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
8. 8.🦾 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 right (b) points straight up (c) points up and left (d) points right
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
10. 10.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
12. 12.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
14. 14.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo moves from 90° to 110°. How many degrees does it turn?
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo program runs:
    angle = 60
    angle = angle + 60
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo moves from 30° to 40°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
23. 23.🦾 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 right (b) points left (c) points up and right (d) points straight up
24. 24.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 150° to 120°. How many degrees does it turn?
27. 27.🦾 A servo moves from 70° to 150°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
29. 29.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
30. 30.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
34. 34.🦾 A servo moves from 0° to 100°. How many degrees does it turn?
35. 35.🦾 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 left (d) points up and right
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
40. 40.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°

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