Robotics Worksheet: DC and Servo Motors

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

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