Robotics Worksheet: DC and Servo Motors

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

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