Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 633 · 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 has just two wires? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo moves from 90° to 110°. How many degrees does it turn?
3. 3.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
6. 6.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
8. 8.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo program runs:
   angle = 130
   angle = angle − 20
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
11. 11.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
16. 16.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
20. 20.🦾 A servo program runs:
    angle = 110
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
23. 23.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
25. 25.🦾 A servo program runs:
    angle = 60
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
27. 27.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
28. 28.🦾 A servo moves from 140° to 70°. How many degrees does it turn?
29. 29.🦾 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 left
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 10
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
32. 32.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
34. 34.🦾 A servo moves from 10° to 120°. How many degrees does it turn?
35. 35.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
36. 36.🦾 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 right (b) points up and left (c) points left (d) points right
37. 37.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
38. 38.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 50
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 180° to 150°. How many degrees does it turn?

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