Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 367 · 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 DC motor. (a) True (b) False
2. 2.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
3. 3.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
4. 4.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
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 right (b) points left (c) points right (d) points up and left
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
8. 8.🦾 A servo program runs:
   angle = 100
   angle = angle + 30
   angle = angle − 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
11. 11.🦾 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 straight up (b) points up and right (c) points right (d) points left
12. 12.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo program runs:
    angle = 60
    angle = angle + 10
    angle = angle − 60
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
19. 19.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
20. 20.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 150° to 90°. 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 = 30
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
29. 29.🦾 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 up and left (b) points right (c) points straight up (d) points up and right
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
31. 31.🦾 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 left (b) points straight up (c) points left (d) points up and right
32. 32.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
33. 33.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
35. 35.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
36. 36.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
37. 37.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
38. 38.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
39. 39.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

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