Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 890 · 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 moves from 160° to 170°. How many degrees does it turn?
2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
3. 3.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
6. 6.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
7. 7.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
8. 8.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
9. 9.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
10. 10.🦾 A servo moves from 110° to 160°. How many degrees does it turn?
11. 11.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
12. 12.🦾 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 left (c) points straight up (d) points up and right
13. 13.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
15. 15.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
16. 16.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
18. 18.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
19. 19.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
21. 21.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 0° to 40°. How many degrees does it turn?
23. 23.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 150° to 80°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 70
    angle = angle − 30
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
30. 30.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo moves from 10° to 60°. How many degrees does it turn?
32. 32.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
34. 34.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
36. 36.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
37. 37.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo moves from 130° to 70°. How many degrees does it turn?
39. 39.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
40. 40.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor

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