Circuits Summary And Series Circuits Flashcards Preview

Abi Science 2016 > Circuits Summary And Series Circuits > Flashcards

Flashcards in Circuits Summary And Series Circuits Deck (41):
1

What does a light bulb need to shine?

Electric current

2

What are the requirements for a circuit?

Conducting wires
Lightbulb
Cell

3

What can be added to a circuit?

Measuring instruments
Switch

4

What does a volt meter measure?

The potential difference of the battery ( ability to deliver energy)

5

What do volt meters measure in?

Volts (V)

6

What does an ammeter measure?

The electric current

7

What does a an ammeter measure in?

Ampères (A)

8

What is a series circuit?

When light bulbs are connected to the cell(s) in a "circle"
The charges have to flow straight through every single part of the circuit

9

How is a volt meter connected to a circuit?

In parallel

10

How is an ammeter connected to a circuit?

In series

11

What are light bulbs connected in parallel?

Each lightbulb is individually connected to the cell
There are multiple pathways for the electrons to flow through

12

What light bulbs glow brighter?

Ones connected in parallel

13

What are the advantages of bulbs connected in parallel?

If one is damaged, the electrons will still flow through the circuit

14

What is an electric charge?

An excess or deficiency of electrons

15

How are charges measured?

Quantity of charge (Q)

16

How is the quantity of charge measured?

In packages of electrons called coulombs (C)

17

What is the function of a cell?

To supply energy to the charges
It is the driving force for the flow of electrons

18

How do voltmeters measure the amount of energy in a circuit?

The difference in electric potential on either side of the cell

19

What does a volt mean?

1 volt means that each coulomb of charge that leaves the cell is provided with 1 joule (J) of energy

20

What is the total loss of energy in a circuit equal to?

The energy provided by the cell

21

How do we measure the intensity (I) electrical current?

As the number of charges which flow past a point in a conductor in a certain period of time

22

What are the two directions of electric current flow?

Conventional
Electron

23

What is electron current?

When electrons flow away from the negative terminal of the battery to the positive terminal of the battery

24

What is conventional current?

When the flow of the charge goes from the positive to the negative terminal of the cell

25

What is resistance a measure of?

How difficult it is for the charges to move through the conductor

26

What two things affect the intensity of current?

Resistance
Volts

27

What is the relationship between current (I) and resistance (R)?

Inverse
Resistance increases
Current decreases

28

What is the relationship between volts (V) and current (I)?

Direct
Voltage increases
Current increases

29

Why do light bulbs in series glow less?

The electrons flow through both bulbs
Bulbs are resistors
More resistance means slower current
Slower current means glows less

30

What is the current in a series circuit like?

It is the same at all points in the series circuit

31

What happens to the voltage in a series circuit?

The initial energy from the battery is divided equally amongst the light bulbs

32

What are the two types of relationships?

Direct
Inverse

33

What does adding more light bulbs in series do?

Makes the lights dimmer

34

How do you find the total voltage in a circuit?

Add the voltage used by each resistor together

35

What are the two types of circuits?

Series
Parallel

36

What is the size of a charge determined by?

The number of electrons lost or gained

37

What is an electric current caused by?

The flow of charges

38

How many electrons are in a coulomb?

6,25 x 10^18

39

Why do electrons flow from the negative to the positive terminal of the battery?

They are negatively charged an opposites attract, like charges repel

40

How is the flow of electrons shown?

Indicated on the conducting wire
An arrow pointing from the negative to positive terminal of the battery
Has e- next to the arrow head

41

Why was conventional current thought to be the way charges flowed?

Although electrons moved from negative to positive, it seemed as if the flow of charges was going the other way