Technology 3 ESO – Unit 6 ELECTRICITY extra activities
1 – Watch the video on “How to Measure Ohms with a Multimeter” and answer:
- a) We should start by verifying what?
- b) Where should we plug the black probe?
- c) Where should we plug the red probe?
- d) We then turn our multimeter to what?
- e) To what range should we turn our multimeter?
- f) How do we test the circuit or component?
- g) What is the problem if the the multimeter reads close to 0? What should we do?
- h) What is the problem if the the multimeter reads “1” or “OL”? What should we do?
- i) What will always indicate the multimeter if we are testing a non-continuous (open) circuit? Why?
- j) When we read a resistor in a circuit, we will often get a reading lower then what is indicated in the colour bands code. How can we get a more precise reading?
2 – Watch the video on “Electric Motor” and answer:
- a) What is the function of the switch?
- b) What happens if we flip the battery?
- c) What poles has a magnet?
- d) What happens to a spinning magnet when we bring another magnet towards it?
- e) How can we make an electromagnet?
- f) Why are electromagnets special?
- g) How do we make the electromagnet spin?
- h) What is the commutator?
- i) What are the brushes?
- j) How does the armature switch polarity?
- k) How can we improve the torque of the motor?
- l) Define: “stator”, “rotor” and “axle”.
