Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 507 · 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 140° to 150°. How many degrees does it turn?
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
4. 4.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
5. 5.🦾 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 left (b) points up and right (c) points right (d) points up and left
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
8. 8.🦾 A servo moves from 140° to 160°. How many degrees does it turn?
9. 9.🦾 A servo moves from 20° to 80°. How many degrees does it turn?
10. 10.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
16. 16.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
17. 17.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
18. 18.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
20. 20.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 40
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
24. 24.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 60
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
26. 26.🦾 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 left (b) points up and right (c) points left (d) points right
27. 27.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
28. 28.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
30. 30.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
31. 31.🦾 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 left (c) points up and right (d) points up and left
32. 32.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 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 right (b) points left (c) points straight up (d) points up and left
35. 35.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
38. 38.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
39. 39.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

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