Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 108 · 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 program runs:
   angle = 60
   angle = angle + 20
   angle = angle − 30
   angle = angle − 30
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
4. 4.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
5. 5.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
6. 6.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
7. 7.🦾 A servo moves from 80° to 110°. How many degrees does it turn?
8. 8.🦾 A servo moves from 110° to 180°. How many degrees does it turn?
9. 9.🦾 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 right (b) points up and left (c) points left (d) points up and right
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
11. 11.⚙️ 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
12. 12.🦾 A servo moves from 120° to 90°. How many degrees does it turn?
13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
14. 14.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
15. 15.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
16. 16.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
17. 17.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
18. 18.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
19. 19.🦾 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 left (b) points up and left (c) points up and right (d) points straight up
20. 20.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 30
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
25. 25.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
26. 26.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 60
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
30. 30.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 60
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 40° to 50°. How many degrees does it turn?
36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
37. 37.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
39. 39.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
40. 40.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True

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