Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 71 · 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 servo moves from 90° to 160°. How many degrees does it turn?
2. 2.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
3. 3.🦾 A servo program runs:
   angle = 160
   angle = angle − 60
   angle = angle + 10
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo program runs:
   angle = 40
   angle = angle − 30
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
6. 6.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
7. 7.🦾 A servo moves from 180° to 120°. How many degrees does it turn?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
11. 11.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
14. 14.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
15. 15.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
16. 16.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
19. 19.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
23. 23.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
24. 24.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
25. 25.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
28. 28.🦾 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 left (b) points straight up (c) points left (d) points right
29. 29.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle + 10
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 110° to 120°. How many degrees does it turn?
33. 33.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo moves from 10° to 120°. How many degrees does it turn?
35. 35.🦾 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 right (b) points left (c) points up and right (d) points up and left
36. 36.🦾 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 right (b) points up and left (c) points up and right (d) points left
37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
39. 39.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
40. 40.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True

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