Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 673 · 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.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
2. 2.🦾 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 up and right (b) points right (c) points left (d) points straight up
3. 3.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
5. 5.⚙️ 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
6. 6.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
8. 8.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
9. 9.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
10. 10.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
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 left (b) points right (c) points straight up (d) points up and left
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
13. 13.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
14. 14.🦾 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 right (b) points right (c) points left (d) points straight up
15. 15.🦾 A servo moves from 130° to 160°. How many degrees does it turn?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
19. 19.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
22. 22.🦾 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 straight up (b) points right (c) points up and left (d) points left
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
24. 24.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo moves from 170° to 40°. How many degrees does it turn?
26. 26.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 140° to 120°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
30. 30.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
35. 35.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 50
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 20
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?

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