Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 17 · 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 60°?
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo moves from 90° to 180°. How many degrees does it turn?
7. 7.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo moves from 140° to 70°. How many degrees does it turn?
9. 9.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
14. 14.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
15. 15.🦾 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 right (c) points straight up (d) points left
16. 16.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
20. 20.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
21. 21.🦾 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 left (c) points right (d) points up and right
22. 22.⚙️ 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
23. 23.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
24. 24.🦾 A servo moves from 110° to 90°. How many degrees does it turn?
25. 25.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 50
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
31. 31.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 80° to 130°. How many degrees does it turn?
34. 34.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
35. 35.🦾 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 right (c) points straight up (d) points up and right
36. 36.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
38. 38.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
39. 39.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
40. 40.True or false: “spins round and round” is true of a DC motor. (a) False (b) True

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