7J Electrical Circuits

Question 1

What do large appliances in your house use

Answer 1

Mains electricity

Question 2

Smaller items use

Answer 2

Cells (batteries)

Question 3

What is an electric current

Answer 3

A flow of electrons

Question 4

What is a circuit

Answer 4

A complete loop that an electric current can flow through

Question 5

What is the current

Answer 5

The amount of electricity that is flowing around a circuit

Question 6

What does current do

Answer 6

Carry energy to the components

Question 7

The larger the current the …..

Answer 7

Brighter the bulb

Question 8

How do we measure current and what is the unit of measurement

Answer 8

We measure using an ammeter

Amps(A)

Question 9

Does current get used up

Answer 9

No it is the same everywhere

Question 10

Components which have a high resistance

Answer 10

Make it difficult for current to flow

Question 11

How do we make the current smaller

Answer 11

We make that current smaller by using a resistor

Question 12

The higher the voltage

Answer 12

The bigger the current

Question 13

How do we make bigger currents

Answer 13

By putting more cells together

Question 14

What is produced by electricity and is it useful

Answer 14

Heat is useful

Question 15

H9w does a light bulb give out l8ghg

Answer 15

The filament ( piece of wire in the middle) has a high resistance so when a current flows through it gets so hot it glows

Question 16

What is a fuss and what does it do

Answer 16

It is a piece of wire that is designed to melt if the current gets to big
It melts so no current can flow ( it breaks the circuit )

Question 17

What are all materials made of ? Hint tiny particles

Answer 17

Atoms

Question 18

Atoms have smaller particles called what in them

Answer 18

Electrons

Question 19

Why are metals conductors

Answer 19

Because electrons can move easily inside them

Question 20

What is a series circuit

Answer 20

A circuit with all components in one loop . If one bulb breaks they all break

Question 21

What is a parallel circuit

Answer 21

Has a lot of branches . If one bulb breaks the others still work

Question 22

Does the current split up in an series circuit or a parallel

Answer 22

Parallel

Question 23

Symbol for cell , lightbulb , ammeter and switch , motor , buzzer

Answer 23

Cell- one long line and one dark thick short line with a space in the middle
Lightbulb - circle with a x in it
Ammeter - a circle with a capital A
Switch - a small circle a line which will be up if it is off and a circle at the beginning of th wire
Motor - circle with motor
Buzzer - like a bowl on a stand

Question 24

What do we call electrical signals sent by the brain and what do they travel by

Answer 24

Impulses and nerves

Question 25

What can an electric shosck do

Answer 25

Burn the skin or stop the nerves from working properly

Question 26

What measure of current can kill a human

Answer 26

0.070A

Question 27

What happens when your skin is wet

Answer 27

It has a lower resistance so a much higher current

Question 28

What does a cell do

Answer 28

Acts like a pump - provides the force to push the charge around - it is called potential difference

Question 29

To calculate total potential difference in a circuit

Answer 29

You add up the potential difference from all the batteries

Question 30

Resistance formula

Answer 30

Potential difference divided by current

Question 31

What is potential difference

Answer 31

The driving force a battery provides