Electricity Topics 4-6

Question 0

What is secondary cells?

Answer 0

Cells that are rechargeable

Question 1

What is a primary cells?

Answer 1

Cells that cannot be recharged

Question 2

What are the advantages of a two cells in serious?

Answer 2

Increase energy or more voltage

Question 3

What are the advantages of a two cells in a parallel?

Answer 3

It last longer

Question 4

What is a thermocouple?

Answer 4

A loop of two wires made of different types of metals that converts heat to energy

Question 5

What is a thermo-electric generator?

Answer 5

converts heat directly into electricity without moving parts

Question 6

What is a piezoelectric effect?

Answer 6

It’s when a sound is produced when an electric current causes vibrations in a tiny crystal

Question 7

What is a generator?

Answer 7

• Its a device that converts mechanical energy to electrical energy for use of external circuit.
• it creates energy

Question 8

What is a cell?

Answer 8

A cell has two charged electrodes

Question 9

What is a battery?

Answer 9

A battery consists of two or more cells connected together

Question 10

What’s the difference between a wet and dry cells? Give examples for each

Answer 10

• Inside a wet cell is wet, ex. car batteries

- Inside a dry cell is dry, ex. D cell

Question 11

What does AC stands for?

Answer 11

Alternating current

Question 12

What does DC stands for?

Answer 12

Direct current

Question 13

What are the five key parts of a motor?

Answer 13

• terminals or post
• brushes
• split ring commutator
• armature
• magnet

Question 14

How does a terminal or a post works in a motor?

Answer 14

It conduct electricity to the brushes

Question 15

How does a brushes work in a motor?

Answer 15

It conduct electricity to the split ring commutator

Question 16

How does a split ring commutator work in a motor?

Answer 16

It’s going to reverse polarity of the armature

Question 17

How does an armature work in a motor?

Answer 17

It’s an electromagnet that repel permanent magnet and it spins

Question 18

How does a magnet work in a motor?

Answer 18

It repel the armature

Question 19

What is an alternating current (AC)?

Answer 19

The current flowing from the generator changes direction or alternates regularly

Question 20

What is a direct current (DC)?

Answer 20

Current that flows in one direction

Question 21

What is an electrode?

Answer 21

The two metals in an electrochemical cell

Question 22

What is an electrolyte?

Answer 22

A substance that conducts an electric current

Question 23

How do you increase the current in a generator and why?

Answer 23

• 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

Question 24

What is an electric generator?

Answer 24

A device that converts mechanical energy into electric energy

Question 25

What do you need to make an electrochemical cells?

Answer 25

• two different metals
• a good electrolyte, salt or acid
• conductor