Topic 4-6

Question 1

What’s an electrode?

Answer 1

The metals at the end of the battery. (Must be different in order to work)

Question 2

What’s an electrolyte?

Answer 2

It’s the substance that is in between the two metal electrodes

Question 3

What’s a primary cell?

Answer 3

A cell that can’t be recharged

Question 4

What’s a secondary cell?

Answer 4

A cell that can be recharged

Question 5

What’s a wet cell?

Answer 5

Cell with a liquid electrolyte

Question 6

What’s a dry cell?

Answer 6

A cell with a paste, plastic or ceramic solid electrolyte

Question 7

What has more voltage:
3 cells connected in parallel or
3 cells connected in series ?

Answer 7

3 cells connected in series. They work together (in a way)

Question 8

What’s a generator ?

Answer 8

It converts -

magnetism (motion) to electricity

Question 9

What’s a DC generator ?

Answer 9

A DC generator is a generator that has a split ring commutator and only produces electricity in one way. It produces electricity by using a magnet and a copper wire

Question 10

What’s an AC generator?

Answer 10

An AC generator, goes in 2 directions and and uses a slip ring commutator. It produces electricity by using magnets and copper wire

Question 11

What’s a motor?

Answer 11

A motor converts:

Electricity to magnetism (motion)

Question 12

What’s a DC motor?

Answer 12

It uses an armature (what the copper wire is on and it spins in the magnet) , a commutator (where the ring is that spins the armature) and a permanent magnet (magnet + copper) to create motion.
Usually used in small appliances

Question 13

What’s an AC motor?

Answer 13

An AC motor uses a stator and rotor (toilet bowl washer in the toilet bowl washer holder) usually used in larger appliances

Question 14

What’s an electromagnet?

Answer 14

An electromagnet is when a iron core is inserted in between copper wire with an electric charge and creates a magnet .

Question 15

What is an electrochemical cell?

Answer 15

It contain electrodes and electrolytes

Question 16

Name 6 ways electricity can be transferred

Answer 16

1. Electricity to heat
2. Heat to electricity
3. Electricity to motion
4. Motion to electricity
5. Electricity to light
6. light to electricity

Sorry for the double one

Question 17

What are thermocouples ?

Answer 17

Thermocouples are decided that convert heat to electricity by heating up metal that sends out electricity

Question 18

What’s the piezoelectric effect?

Answer 18

This is when current is passed through a crystal creating a vibration or sound
Ex. Those talking cards
(Motion - electricity )

Question 19

Explain the piezoelectric crystal in reverse

Answer 19

That’s when you compress the crystal to create a vibration that then sends electricity out
Ex. A BBQ lighter
(Motion to electricity )

Question 20

Explain how electricity can be turned into lights + give examples

Answer 20

The electricity travels through a resistor which then gets really hot creating a glow to form light :)
Ex. Incase cent bulbs and LED lights

Question 21

What’s a photovoltaic cell?

Answer 21

A photovoltaic cell takes light and breaks it down and turns it into electricity
Ex. Solar panels and calculators
(Light to electricity )

Question 22

What’s an electrochemical cell?

Answer 22

A battery that works because of w chemical reaction causing electricity