Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 53 · 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 moves an arm joint? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo program runs:
   angle = 30
   angle = angle + 40
   angle = angle − 10
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo program runs:
   angle = 10
   angle = angle + 30
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
4. 4.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
7. 7.🦾 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 up and right (c) points left (d) points up and left
8. 8.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
9. 9.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
10. 10.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
11. 11.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.🦾 A servo moves from 10° to 180°. How many degrees does it turn?
15. 15.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
16. 16.🦾 A servo program runs:
    angle = 120
    angle = angle − 40
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
19. 19.⚙️ 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
20. 20.🦾 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 straight up (b) points up and left (c) points left (d) points right
21. 21.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
22. 22.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
23. 23.🦾 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 straight up (b) points up and left (c) points right (d) points left
24. 24.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 10
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
27. 27.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
28. 28.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
29. 29.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
30. 30.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo moves from 80° to 120°. How many degrees does it turn?
32. 32.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo moves from 80° to 110°. How many degrees does it turn?
34. 34.🦾 A servo moves from 90° to 180°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 10
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 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 straight up (c) points up and right (d) points right

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