Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 501 · 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 program runs:
   angle = 160
   angle = angle − 40
   angle = angle − 60
   angle = angle + 60
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
3. 3.🦾 A servo program runs:
   angle = 40
   angle = angle + 20
   angle = angle − 60
   angle = angle + 20
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo moves from 50° to 130°. How many degrees does it turn?
5. 5.🦾 A servo program runs:
   angle = 70
   angle = angle − 20
   angle = angle − 20
   angle = angle + 20
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
7. 7.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
8. 8.🦾 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 right (b) points up and left (c) points up and right (d) points left
9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo program runs:
    angle = 60
    angle = angle − 40
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
15. 15.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
17. 17.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
18. 18.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
19. 19.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
20. 20.🦾 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 up and left (c) points right (d) points left
21. 21.⚙️ DC motor or servo motor: which one has just two wires? (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 90°. Where does the arm point? (a) points left (b) points up and left (c) points straight up (d) points right
23. 23.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
24. 24.🦾 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 up and left (b) points up and right (c) points straight up (d) points left
25. 25.🦾 A servo program runs:
    angle = 140
    angle = angle − 10
    angle = angle − 30
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ 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
27. 27.🦾 A servo moves from 100° to 150°. How many degrees does it turn?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
30. 30.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
32. 32.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
33. 33.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
34. 34.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
35. 35.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
36. 36.🦾 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 left (b) points up and right (c) points right (d) points left
37. 37.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
39. 39.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 60
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?

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