Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 453 · 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.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
2. 2.🦾 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 right (b) points straight up (c) points left (d) points right
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
4. 4.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
7. 7.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo program runs:
    angle = 120
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
12. 12.🦾 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 right (c) points up and right (d) points straight up
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
14. 14.🦾 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 left (b) points right (c) points straight up (d) points up and right
15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
17. 17.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
19. 19.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
21. 21.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
23. 23.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
25. 25.🦾 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 right (b) points left (c) points up and left (d) points straight up
26. 26.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
28. 28.🦾 A servo moves from 90° to 40°. How many degrees does it turn?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
30. 30.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
31. 31.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
32. 32.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
33. 33.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle + 20
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
36. 36.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
38. 38.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
39. 39.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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