Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 924 · 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.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
4. 4.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
5. 5.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
7. 7.🦾 A servo moves from 60° to 160°. How many degrees does it turn?
8. 8.⚙️ 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
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
11. 11.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
13. 13.🦾 A servo moves from 180° to 50°. How many degrees does it turn?
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
15. 15.🦾 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 left (b) points up and right (c) points up and left (d) points right
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
17. 17.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
20. 20.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo moves from 40° to 60°. How many degrees does it turn?
22. 22.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
25. 25.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 up and left (b) points up and right (c) points left (d) points straight up
28. 28.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
29. 29.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
30. 30.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
31. 31.🦾 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 straight up (b) points up and left (c) points right (d) points left
32. 32.🦾 A servo moves from 60° to 70°. How many degrees does it turn?
33. 33.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
34. 34.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
35. 35.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
36. 36.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
37. 37.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 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 straight up (c) points right (d) points up and left
39. 39.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
40. 40.True or false: “has just two wires” is true of a servo motor. (a) False (b) True

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