EMF sources

Instructions:

For the 12 questions:

• choose the correct answer
• write down your answer.

Note:

• You can print this page and write you answers onto it.

 

1. A photovoltaic cell is used in which method of EMF generation?

1. Pressure.
2. Light.
3. Heat.
4. Magnetism.

 

2. A piezo element is used in which method of EMF generation?

1. Pressure.
2. Light.
3. Heat.
4. Magnetism.

 

3. The looped wire (or wires) that rotate in a generator is called the ...

1. Stator.
2. Armature.
3. Prime mover.
4. Slip ring.

 

4. When a single looped wire rotates 360 degrees between a magnetic field, what type of current is generated in the wire?

1. Direct (DC).
2. Alternating (AC).

 

5. A voltage can be generated by heating the junction of ...

1. Two dissimilar metals.
2. Two pieces of the same metal.
3. Two pieces of poly carbonite.

 

6. A thermocouple is used in which method of EMF generation?

1. Pressure.
2. Light.
3. Heat.
4. Magnetism.

 

7. The electrolyte in a wet cell battery is ...

1. Zinc.
2. Copper.
3. Diluted sulphuric acid.

 

8. Primary cells are designed ...

1. to be recharged.
2. not to be recharged.

 

9. Electrolyte is designed to ...

1. allow the flow of electrons (conduct).
2. oppose the flow of electrons (insulate).

 

10. What three things are required to generate an EMF using magnetism?

1. Conductor, wiring, magnets.
2. Magnets, electrolyte, conductors.
3. Magnets, conductor, movement.

 

11. A quartz crystal is used in which of the following EMF generation methods?

1. Pressure.
2. Light.
3. Heat.
4. Magnetism.

 

12. A semi-conductor is used in which of the following EMF generation methods?

1. Pressure.
2. Light.
3. Heat.
4. Magnetism.

 

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