Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 821 · 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.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
2. 2.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
4. 4.True or false: “moves an arm joint” 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 135°. Where does the arm point? (a) points left (b) points up and right (c) points straight up (d) points up and left
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
8. 8.🦾 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 right (b) points up and right (c) points left (d) points up and left
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
10. 10.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo program runs:
    angle = 90
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
15. 15.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
17. 17.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
19. 19.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
20. 20.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 10
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 20
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
24. 24.🦾 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 left (d) points up and right
25. 25.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
26. 26.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
30. 30.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
32. 32.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
34. 34.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
36. 36.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
38. 38.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 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 left (b) points up and right (c) points straight up (d) points right

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