Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 997 · 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.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
3. 3.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
4. 4.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
5. 5.🦾 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 right (b) points straight up (c) points left (d) points right
6. 6.🦾 A servo moves from 70° to 170°. How many degrees does it turn?
7. 7.🦾 A servo moves from 30° to 130°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
9. 9.🦾 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 up and right (b) points right (c) points straight up (d) points left
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.🦾 A servo moves from 170° to 50°. How many degrees does it turn?
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
13. 13.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 50
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 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 left (b) points up and left (c) points up and right (d) points right
15. 15.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
18. 18.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 30
    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 servo motor (b) a light sensor (c) a DC motor (d) a buzzer
22. 22.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle + 40
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
27. 27.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.🦾 A servo moves from 180° to 150°. How many degrees does it turn?
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
32. 32.🦾 A servo moves from 90° to 180°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 20
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 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 left (d) points right
35. 35.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
38. 38.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
40. 40.True or false: “has just two wires” is true of a DC motor. (a) True (b) False

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