Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 659 · 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: “has just two wires” is true of a DC motor. (a) True (b) False
2. 2.🦾 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 left (d) points up and right
3. 3.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
4. 4.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
5. 5.🦾 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 right (b) points left (c) points straight up (d) points right
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
7. 7.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
8. 8.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
12. 12.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
14. 14.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
19. 19.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
22. 22.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
23. 23.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
24. 24.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
28. 28.🦾 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 left
29. 29.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 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 straight up (c) points left (d) points up and right
33. 33.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
34. 34.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
35. 35.🦾 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 left (b) points straight up (c) points up and right (d) points left
36. 36.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
38. 38.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo moves from 120° to 60°. How many degrees does it turn?
40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True

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