Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 552 · 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 motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
4. 4.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
5. 5.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
7. 7.🦾 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 straight up (b) points up and right (c) points right (d) points left
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
12. 12.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
14. 14.🦾 A servo moves from 90° 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 45°. Where does the arm point? (a) points left (b) points straight up (c) points right (d) points up and right
16. 16.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle + 20
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 60
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
21. 21.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
22. 22.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
27. 27.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
28. 28.🦾 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 left (c) points right (d) points up and right
29. 29.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 60
    angle = angle − 10
    angle = angle + 60
    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.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
33. 33.🦾 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 straight up (b) points left (c) points right (d) points up and left
34. 34.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 60
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
39. 39.🦾 A servo moves from 140° to 80°. How many degrees does it turn?
40. 40.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True

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