Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 596 · 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 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 left (b) points right (c) points straight up (d) points up and right
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo moves from 50° to 70°. How many degrees does it turn?
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
6. 6.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
7. 7.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
8. 8.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
9. 9.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
10. 10.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 50
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 50
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
18. 18.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
21. 21.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
23. 23.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
26. 26.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
27. 27.True or false: “moves an arm joint” 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 DC motor (b) a servo motor
29. 29.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 50
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo moves from 100° to 170°. How many degrees does it turn?
34. 34.🦾 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 right (d) points left
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
36. 36.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo moves from 20° to 80°. How many degrees does it turn?
38. 38.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor

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