Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 721 · 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.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
2. 2.⚙️ 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
3. 3.🦾 A servo program runs:
   angle = 130
   angle = angle − 40
   angle = angle − 60
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
5. 5.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
6. 6.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
7. 7.🦾 A servo moves from 10° to 140°. How many degrees does it turn?
8. 8.🦾 A servo moves from 170° to 40°. How many degrees does it turn?
9. 9.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
12. 12.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
13. 13.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
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 up and right (b) points left (c) points up and left (d) points straight up
15. 15.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
16. 16.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 10
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
19. 19.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
21. 21.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 40
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 10° to 100°. How many degrees does it turn?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
25. 25.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 left (b) points up and left (c) points up and right (d) points straight up
28. 28.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
31. 31.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
32. 32.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
35. 35.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
39. 39.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo moves from 150° to 80°. How many degrees does it turn?

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