Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 740 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
3. 3.⚙️ 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
4. 4.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
5. 5.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (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 45°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points up and left
9. 9.⚙️ 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
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
11. 11.🦾 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 straight up (c) points right (d) points left
12. 12.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
13. 13.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
14. 14.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 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 up and right (d) points left
18. 18.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
19. 19.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo moves from 80° to 20°. How many degrees does it turn?
21. 21.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
22. 22.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle − 20
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 60
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
29. 29.🦾 A servo moves from 30° to 140°. How many degrees does it turn?
30. 30.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
32. 32.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 50
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 170° to 10°. How many degrees does it turn?
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo moves from 140° to 80°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
38. 38.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
39. 39.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo moves from 10° to 0°. How many degrees does it turn?

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