Robotics Worksheet: DC and Servo Motors

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

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