Robotics Worksheet: DC and Servo Motors

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

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