Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 20 · 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: “spins faster with more V” is true of a servo motor. (a) False (b) True
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
3. 3.🦾 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 straight up (c) points up and right (d) points right
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.🦾 A servo program runs:
   angle = 60
   angle = angle + 10
   angle = angle + 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
7. 7.🦾 A servo program runs:
   angle = 50
   angle = angle − 40
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
11. 11.🦾 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 right (b) points left (c) points up and left (d) points up and right
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
14. 14.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
17. 17.🦾 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 left (c) points straight up (d) points right
18. 18.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
24. 24.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
25. 25.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
26. 26.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
27. 27.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
28. 28.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
29. 29.🦾 A servo moves from 100° to 60°. How many degrees does it turn?
30. 30.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
32. 32.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
37. 37.🦾 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 straight up (d) points left
38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 30
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 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 right (c) points up and right (d) points left
40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle − 10
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?

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