Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 2 · 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) 180° (d) 18°
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo program runs:
   angle = 160
   angle = angle − 60
   angle = angle + 60
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
5. 5.🦾 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
6. 6.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
7. 7.🦾 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 right (c) points left (d) points up and right
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle − 20
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 20
    angle = angle − 60
    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) paint it red (b) swap its two wires (c) add more wheels (d) shake it
13. 13.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
14. 14.🦾 A servo moves from 180° to 170°. How many degrees does it turn?
15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
16. 16.⚙️ 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
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
19. 19.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
20. 20.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
22. 22.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
23. 23.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
24. 24.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 50
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
27. 27.🦾 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 left (b) points up and left (c) points straight up (d) points up and right
28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 20
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
30. 30.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
32. 32.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
36. 36.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
37. 37.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
40. 40.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor

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