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Abi Science 2016 > Circuits Summary And Series Circuits > Flashcards

Circuits Summary And Series Circuits Flashcards

1
Q

What does a light bulb need to shine?

A

Electric current

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2
Q

What are the requirements for a circuit?

A

Conducting wires
Lightbulb
Cell

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3
Q

What can be added to a circuit?

A

Measuring instruments

Switch

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4
Q

What does a volt meter measure?

A

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

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5
Q

What do volt meters measure in?

A

Volts (V)

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6
Q

What does an ammeter measure?

A

The electric current

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7
Q

What does a an ammeter measure in?

A

Ampères (A)

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8
Q

What is a series circuit?

A

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

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9
Q

How is a volt meter connected to a circuit?

A

In parallel

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10
Q

How is an ammeter connected to a circuit?

A

In series

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11
Q

What are light bulbs connected in parallel?

A

Each lightbulb is individually connected to the cell

There are multiple pathways for the electrons to flow through

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12
Q

What light bulbs glow brighter?

A

Ones connected in parallel

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13
Q

What are the advantages of bulbs connected in parallel?

A

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

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14
Q

What is an electric charge?

A

An excess or deficiency of electrons

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15
Q

How are charges measured?

A

Quantity of charge (Q)

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16
Q

How is the quantity of charge measured?

A

In packages of electrons called coulombs (C)

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17
Q

What is the function of a cell?

A

To supply energy to the charges

It is the driving force for the flow of electrons

18
Q

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

A

The difference in electric potential on either side of the cell

19
Q

What does a volt mean?

A

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

20
Q

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

A

The energy provided by the cell

21
Q

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

A

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

22
Q

What are the two directions of electric current flow?

A

Conventional

Electron

23
Q

What is electron current?

A

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

24
Q

What is conventional current?

A

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

25
Q

What is resistance a measure of?

A

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

26
Q

What two things affect the intensity of current?

A

Resistance

Volts

27
Q

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

A

Inverse
Resistance increases
Current decreases

28
Q

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

A

Direct
Voltage increases
Current increases

29
Q

Why do light bulbs in series glow less?

A

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

30
Q

What is the current in a series circuit like?

A

It is the same at all points in the series circuit

31
Q

What happens to the voltage in a series circuit?

A

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

32
Q

What are the two types of relationships?

A

Direct

Inverse

33
Q

What does adding more light bulbs in series do?

A

Makes the lights dimmer

34
Q

How do you find the total voltage in a circuit?

A

Add the voltage used by each resistor together

35
Q

What are the two types of circuits?

A

Series

Parallel

36
Q

What is the size of a charge determined by?

A

The number of electrons lost or gained

37
Q

What is an electric current caused by?

A

The flow of charges

38
Q

How many electrons are in a coulomb?

A

6,25 x 10^18

39
Q

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

A

They are negatively charged an opposites attract, like charges repel

40
Q

How is the flow of electrons shown?

A

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
Q

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

A

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

Abi Science 2016 (16 decks)

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