Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 433 · 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 160° to 90°. How many degrees does it turn?
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
5. 5.🦾 A servo program runs:
   angle = 40
   angle = angle + 10
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo program runs:
   angle = 40
   angle = angle + 20
   angle = angle + 10
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo moves from 150° to 170°. 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.🦾 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 left (b) points straight up (c) points up and right (d) points right
11. 11.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo moves from 150° to 100°. How many degrees does it turn?
14. 14.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
15. 15.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
19. 19.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
20. 20.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
21. 21.🦾 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 left (b) points right (c) points up and left (d) points up and right
22. 22.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
23. 23.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
26. 26.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
27. 27.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
30. 30.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo moves from 40° to 160°. How many degrees does it turn?
33. 33.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
34. 34.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 50
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 150° to 0°. How many degrees does it turn?
39. 39.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

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