Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 883 · 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 spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
2. 2.🦾 A servo program runs:
   angle = 50
   angle = angle − 40
   angle = angle + 30
   angle = angle − 20
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
4. 4.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
5. 5.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
6. 6.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
8. 8.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
9. 9.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
12. 12.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
13. 13.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo moves from 100° to 10°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo program runs:
    angle = 110
    angle = angle − 60
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 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 straight up (c) points left (d) points right
26. 26.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
27. 27.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo moves from 160° to 50°. How many degrees does it turn?
29. 29.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
32. 32.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle − 50
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 10
    angle = angle + 40
    angle = angle + 20
    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 150°?
40. 40.True or false: “has just two wires” is true of a servo motor. (a) False (b) True

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