Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 961 · 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 common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
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 round and round” is true of a DC motor. (a) True (b) False
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
5. 5.🦾 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 up and right (b) points straight up (c) points right (d) points up and left
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
7. 7.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo program runs:
    angle = 120
    angle = angle + 50
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle + 50
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 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 left (d) points up and left
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
15. 15.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
16. 16.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 40
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 60
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
20. 20.🦾 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 left (b) points up and right (c) points right (d) points straight up
21. 21.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
23. 23.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
29. 29.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
30. 30.🦾 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
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
33. 33.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
34. 34.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
37. 37.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 60° to 130°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor

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