Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 402 · 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 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 left (c) points up and left (d) points straight up
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
4. 4.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
5. 5.🦾 A servo moves from 50° to 150°. How many degrees does it turn?
6. 6.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
7. 7.🦾 A servo program runs:
   angle = 170
   angle = angle + 10
   angle = angle − 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
9. 9.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
10. 10.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
13. 13.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
15. 15.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
16. 16.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
17. 17.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
18. 18.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 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 right (c) points up and left (d) points left
23. 23.🦾 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 left (d) points right
24. 24.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
26. 26.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
32. 32.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
33. 33.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
34. 34.🦾 A servo moves from 120° to 80°. How many degrees does it turn?
35. 35.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 50
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
38. 38.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
40. 40.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°

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