Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 888 · 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 moves from 80° to 110°. How many degrees does it turn?
2. 2.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
3. 3.⚙️ 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
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
5. 5.🦾 A servo program runs:
   angle = 20
   angle = angle + 60
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
7. 7.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo program runs:
   angle = 170
   angle = angle − 30
   angle = angle − 60
   angle = angle + 60
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 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 up and right (b) points left (c) points up and left (d) points straight up
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
13. 13.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
15. 15.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
17. 17.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
20. 20.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
23. 23.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 140
    angle = angle + 30
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
29. 29.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
30. 30.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 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 right (b) points up and left (c) points up and right (d) points left
33. 33.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
35. 35.🦾 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
36. 36.🦾 A servo moves from 80° to 100°. How many degrees does it turn?
37. 37.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
38. 38.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo moves from 110° to 160°. How many degrees does it turn?
40. 40.🦾 A servo moves from 20° to 40°. How many degrees does it turn?

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