Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 19 · 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: “turns to an exact angle” is true of a DC motor. (a) True (b) False
2. 2.🦾 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 right (b) points straight up (c) points right (d) points up and left
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
7. 7.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
8. 8.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
10. 10.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
12. 12.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
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 left (b) points up and right (c) points straight up (d) points right
15. 15.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
16. 16.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
18. 18.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
20. 20.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
23. 23.🦾 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 up and left (c) points up and right (d) points right
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
25. 25.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
26. 26.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
27. 27.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 20° to 30°. How many degrees does it turn?
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
32. 32.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle − 30
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle + 10
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
38. 38.🦾 A servo moves from 170° to 100°. How many degrees does it turn?
39. 39.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
40. 40.🦾 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

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