Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 274 · 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 80° to 160°. How many degrees does it turn?
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
4. 4.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
5. 5.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
6. 6.🦾 A servo program runs:
   angle = 80
   angle = angle − 10
   angle = angle − 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
9. 9.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
10. 10.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
11. 11.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
15. 15.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
17. 17.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
18. 18.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
19. 19.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 60
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
22. 22.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
24. 24.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 30
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo moves from 170° to 90°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
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 straight up (b) points up and left (c) points right (d) points left
30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 60
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
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 up and right (b) points right (c) points up and left (d) points left
35. 35.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
37. 37.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
39. 39.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
40. 40.True or false: “spins round and round” is true of a DC motor. (a) False (b) True

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