Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 60 · 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 faster with more V? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo program runs:
   angle = 170
   angle = angle − 40
   angle = angle − 40
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
6. 6.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo moves from 70° to 150°. How many degrees does it turn?
9. 9.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
11. 11.🦾 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 left (b) points left (c) points up and right (d) points straight up
12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
14. 14.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
15. 15.🦾 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 straight up (b) points right (c) points up and left (d) points left
16. 16.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
17. 17.True or false: “usually turns 0° to 180°” 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 up and left (b) points up and right (c) points straight up (d) points right
19. 19.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
24. 24.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo moves from 140° to 80°. How many degrees does it turn?
26. 26.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 30
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
31. 31.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
32. 32.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
33. 33.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
34. 34.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 20
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 50
    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 − 40
    angle = angle − 40
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
39. 39.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True

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