Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 959 · 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 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 left (b) points right (c) points up and right (d) points straight up
2. 2.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
3. 3.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
4. 4.🦾 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 right (c) points up and right (d) points up and left
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
9. 9.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
10. 10.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
11. 11.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
18. 18.🦾 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 straight up (b) points up and right (c) points right (d) points left
19. 19.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
22. 22.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle + 30
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
25. 25.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
26. 26.⚙️ 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
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
29. 29.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo moves from 20° to 100°. How many degrees does it turn?
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
32. 32.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
33. 33.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
34. 34.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
35. 35.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
36. 36.🦾 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 left (c) points up and right (d) points up and left
37. 37.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 150° to 90°. How many degrees does it turn?
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 = 140
    angle = angle − 20
    angle = angle − 50
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids