Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 992 · 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) shake it (b) paint it red (c) swap its two wires (d) add more wheels
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
3. 3.🦾 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 up and right (c) points right (d) points up and left
4. 4.🦾 A servo moves from 10° to 170°. How many degrees does it turn?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
7. 7.🦾 A servo moves from 110° to 150°. 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 0°. Where does the arm point? (a) points right (b) points left (c) points straight up (d) points up and left
9. 9.🦾 A servo moves from 90° to 50°. How many degrees does it turn?
10. 10.🦾 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 straight up (c) points up and right (d) points left
11. 11.🦾 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 right (c) points right (d) points left
12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
15. 15.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
17. 17.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 110° to 180°. How many degrees does it turn?
20. 20.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
22. 22.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 60
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 60° to 150°. How many degrees does it turn?
24. 24.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
25. 25.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
26. 26.🦾 A servo moves from 90° to 160°. How many degrees does it turn?
27. 27.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
30. 30.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
31. 31.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
32. 32.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
33. 33.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
34. 34.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo moves from 40° to 160°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
38. 38.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor

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