Electricity Topics 4-6 Flashcards
What is secondary cells?
Cells that are rechargeable
What is a primary cells?
Cells that cannot be recharged
What are the advantages of a two cells in serious?
Increase energy or more voltage
What are the advantages of a two cells in a parallel?
It last longer
What is a thermocouple?
A loop of two wires made of different types of metals that converts heat to energy
What is a thermo-electric generator?
converts heat directly into electricity without moving parts
What is a piezoelectric effect?
It’s when a sound is produced when an electric current causes vibrations in a tiny crystal
What is a generator?
- Its a device that converts mechanical energy to electrical energy for use of external circuit.
- it creates energy
What is a cell?
A cell has two charged electrodes
What is a battery?
A battery consists of two or more cells connected together
What’s the difference between a wet and dry cells? Give examples for each
- Inside a wet cell is wet, ex. car batteries
- Inside a dry cell is dry, ex. D cell
What does AC stands for?
Alternating current
What does DC stands for?
Direct current
What are the five key parts of a motor?
- terminals or post
- brushes
- split ring commutator
- armature
- magnet
How does a terminal or a post works in a motor?
It conduct electricity to the brushes
How does a brushes work in a motor?
It conduct electricity to the split ring commutator
How does a split ring commutator work in a motor?
It’s going to reverse polarity of the armature
How does an armature work in a motor?
It’s an electromagnet that repel permanent magnet and it spins
How does a magnet work in a motor?
It repel the armature
What is an alternating current (AC)?
The current flowing from the generator changes direction or alternates regularly
What is a direct current (DC)?
Current that flows in one direction
What is an electrode?
The two metals in an electrochemical cell
What is an electrolyte?
A substance that conducts an electric current
How do you increase the current in a generator and why?
- increase coil of wire because the more coils, the more electrons able to moved
- increase magnet strength because the stronger the magnet, the stronger the pull on the electrons
- increase movement because it needs to move in order to get a current to happen
What is an electric generator?
A device that converts mechanical energy into electric energy
What do you need to make an electrochemical cells?
- two different metals
- a good electrolyte, salt or acid
- conductor
