Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 528 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo moves from 30° to 130°. How many degrees does it turn?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
9. 9.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 20
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
13. 13.🦾 A servo moves from 40° to 60°. How many degrees does it turn?
14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
15. 15.🦾 A servo moves from 80° to 120°. How many degrees does it turn?
16. 16.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
19. 19.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
20. 20.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
21. 21.🦾 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 left (b) points up and left (c) points straight up (d) points right
22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
23. 23.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 30
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle − 30
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo moves from 10° to 140°. How many degrees does it turn?
26. 26.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
27. 27.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
28. 28.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 50
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
32. 32.🦾 A servo moves from 130° to 70°. How many degrees does it turn?
33. 33.🦾 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 straight up (b) points left (c) points up and right (d) points up and left
34. 34.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
37. 37.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
40. 40.🦾 A servo moves from 0° to 110°. How many degrees does it turn?

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