Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 9 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
3. 3.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
4. 4.🦾 A servo moves from 80° to 20°. How many degrees does it turn?
5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
9. 9.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
11. 11.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
13. 13.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
14. 14.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
15. 15.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
16. 16.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
17. 17.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle + 60
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 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 left (c) points right (d) points up and right
19. 19.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
21. 21.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
22. 22.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
25. 25.🦾 A servo moves from 160° to 50°. How many degrees does it turn?
26. 26.🦾 A servo moves from 110° to 140°. How many degrees does it turn?
27. 27.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 40
    angle = angle + 20
    angle = angle + 60
    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.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
33. 33.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 10
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 30° to 130°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 110
    angle = angle − 40
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 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 left (c) points up and right (d) points up and left
38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo moves from 50° to 10°. How many degrees does it turn?
40. 40.True or false: “has just two wires” is true of a servo motor. (a) False (b) True

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