Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 352 · 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 fan (b) a DC motor (c) a buzzer (d) a servo motor
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
5. 5.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
6. 6.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
9. 9.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
14. 14.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
15. 15.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
16. 16.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
17. 17.🦾 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 right (b) points straight up (c) points up and left (d) points left
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
21. 21.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
25. 25.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
26. 26.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
27. 27.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 50
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
32. 32.🦾 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 up and right (b) points straight up (c) points right (d) points left
33. 33.🦾 A servo moves from 30° to 160°. How many degrees does it turn?
34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 10° to 180°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 90
    angle = angle + 50
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

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