Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 787 · 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 common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo moves from 130° to 140°. How many degrees does it turn?
4. 4.🦾 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 right (b) points up and left (c) points straight up (d) points right
5. 5.🦾 A servo program runs:
   angle = 60
   angle = angle − 10
   angle = angle + 30
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
7. 7.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
8. 8.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
9. 9.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
10. 10.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
13. 13.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
14. 14.🦾 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 left (b) points straight up (c) points up and right (d) points up and left
15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 10
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) 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 left (b) points right (c) points straight up (d) points up and left
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
22. 22.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
24. 24.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 40
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
27. 27.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
28. 28.⚙️ 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
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
30. 30.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
33. 33.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 40
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
37. 37.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
39. 39.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
40. 40.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor

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