Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 192 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
2. 2.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
5. 5.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
6. 6.🦾 A servo moves from 150° to 110°. How many degrees does it turn?
7. 7.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo program runs:
   angle = 40
   angle = angle + 40
   angle = angle − 30
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 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 up and right (b) points left (c) points right (d) points up and left
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
12. 12.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 10
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
14. 14.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
15. 15.True or false: “drives the wheels” 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 60°?
17. 17.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
23. 23.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle + 10
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
26. 26.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle + 10
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 70° to 160°. How many degrees does it turn?
34. 34.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
35. 35.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 50
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
38. 38.🦾 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 up and right (b) points straight up (c) points right (d) points left
39. 39.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
40. 40.🦾 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 left (b) points straight up (c) points up and left (d) points right

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