Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 689 · 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.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
3. 3.🦾 A servo moves from 0° to 40°. How many degrees does it turn?
4. 4.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
7. 7.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo moves from 170° to 10°. How many degrees does it turn?
9. 9.🦾 A servo moves from 90° to 160°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
11. 11.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
13. 13.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
14. 14.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
15. 15.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
17. 17.🦾 A servo moves from 60° to 0°. How many degrees does it turn?
18. 18.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
19. 19.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
22. 22.🦾 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 right (b) points straight up (c) points right (d) points up and left
23. 23.🦾 A servo moves from 110° to 170°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
26. 26.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
27. 27.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
31. 31.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
35. 35.🦾 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 left (c) points up and right (d) points straight up
36. 36.🦾 A servo moves from 130° to 40°. How many degrees does it turn?
37. 37.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
39. 39.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor

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