Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 515 · 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 has a signal wire? (a) a DC motor (b) a servo motor
2. 2.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
3. 3.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
4. 4.🦾 A servo program runs:
   angle = 0
   angle = angle + 40
   angle = angle − 20
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
7. 7.🦾 A servo program runs:
   angle = 0
   angle = angle + 40
   angle = angle + 20
   angle = angle + 10
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo moves from 140° to 160°. How many degrees does it turn?
9. 9.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
12. 12.🦾 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 right (c) points up and right (d) points straight up
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
14. 14.🦾 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 right (d) points up and left
15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
16. 16.🦾 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 straight up (c) points left (d) points right
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
19. 19.🦾 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 up and right (d) points up and left
20. 20.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
22. 22.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
23. 23.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
24. 24.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
31. 31.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    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 moves from 80° to 10°. How many degrees does it turn?
35. 35.⚙️ 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
36. 36.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
37. 37.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 170° to 80°. How many degrees does it turn?
40. 40.🦾 A servo moves from 110° to 180°. How many degrees does it turn?

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