Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 935 · 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.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
2. 2.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
3. 3.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
7. 7.🦾 A servo program runs:
   angle = 120
   angle = angle + 40
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo moves from 30° to 160°. How many degrees does it turn?
9. 9.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
10. 10.🦾 A servo moves from 50° to 70°. How many degrees does it turn?
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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
13. 13.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
14. 14.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
15. 15.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
17. 17.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
18. 18.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 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 left (b) points up and right (c) points straight up (d) points left
21. 21.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
22. 22.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 50
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
24. 24.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
28. 28.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 140° to 110°. How many degrees does it turn?
30. 30.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
32. 32.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
34. 34.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle − 10
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
36. 36.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
38. 38.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
39. 39.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
40. 40.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°

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