Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 123 · 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 moves from 30° to 50°. How many degrees does it turn?
2. 2.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
3. 3.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
6. 6.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
8. 8.⚙️ 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
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
10. 10.🦾 A servo program runs:
    angle = 90
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
11. 11.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
13. 13.🦾 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 straight up (c) points right (d) points up and right
14. 14.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
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 right (b) points up and left (c) points left (d) points straight up
18. 18.🦾 A servo moves from 60° to 110°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo moves from 50° to 160°. How many degrees does it turn?
21. 21.🦾 A servo moves from 40° to 110°. How many degrees does it turn?
22. 22.🦾 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 right (b) points straight up (c) points left (d) points right
23. 23.🦾 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 up and right (b) points straight up (c) points left (d) points up and left
24. 24.⚙️ 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
25. 25.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
26. 26.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 120° to 20°. How many degrees does it turn?
28. 28.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
30. 30.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
31. 31.🦾 A servo moves from 0° to 170°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
37. 37.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
38. 38.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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