Circuit Components And Current-Voltage Graphs Flashcards

To learn about circuit components and the characteristics of various graphs

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1
Q

What is the resistance when:
Potential difference=230V
Current=7A

A

32.9 Ohms

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2
Q

Why does a diode need a resistor placed in series?

A

To prevent a high current from damaging it

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3
Q

What pattern is shown by the graph of a filament graph?

A

As the voltage increased, the current increased at a slowing rate

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4
Q

What pattern is shown by the graph of a diode?

A

As voltage increases, the current increased at an increasing rate

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5
Q

In a metal there are ____________ electrons that can move through the material when connected to a voltage. The _______ electrons move between the _________ ions that make up the rest of the metal

A

Delocalised
Free
Positive

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6
Q

The resistance will be affected by the ____________ and ______________ of the positive metal ions.

A

Spacing

Vibration

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7
Q

What are the 4 factors that affect the resistance of a wire?

A

Material
Length
Cross-sectional area
Temperature

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8
Q

What are current voltage graphs also known as?

A

I-V graphs

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9
Q

In I-V graphs, we plot current on the ___-axis and voltage on the ___-axis.

A

Y

X

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10
Q

How are current-voltage graphs useful?

A

They are useful for comparing the behaviour of circuit components

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11
Q

If a graph is a straight line through the origin, the resistance is the _________ of the ___________.

If not, resistance is found for a point on a line by finding the _________ reading and dividing it by the _________ reading.

A

Inverse
Gradient
Voltage
Current

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12
Q

An LED allows current to flow any direction

True or False?

A

False

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13
Q

A hot wire has _________ resistance as it is __________ for electrons to pass through it

A

Greater

Harder

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14
Q

Filament lamp allows current to flow in both directions

True or False?

A

True

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15
Q

What are the advantages of LED’s?

A

Long lifetime
More robust
Switch on quickly
More efficient

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16
Q

In series, the current is the _______ at all points

A

Same

17
Q

In series, the voltage provided is equal to the ______ of the voltages of the components

A

Sum

18
Q

In parallel, each branch receives the _____ voltage

A

Same

19
Q

In parallel, the ____ of the current in the branches __________ the total current

A

Sum

Equals

20
Q

V = ?

A

I x R

21
Q

Diodes have very ______ resistance in the ___________ direction to which it was intended

A

High

Reverse

22
Q

If a graph is a _________ line through the origin, the ____________ is the inverse of the ____________

A

Straight
Resistance
Gradient

23
Q

To find resistance for a point on a line, we do:

___________ reading

A

Current

24
Q

For a fixed resistor, the current is directly proportional to the …?

This relationship also applies if the flow of electricity is …?

A

Voltage

Reversed

25
Q

How do filament lamps produce light?

As the ___________ increases, the lamp gets hot

The hit wire has ________ resistance as it is __________ for the electrons to pass through it

A

By heating up a filament tungsten

Current

Greater
Harder

26
Q

Filament lamps allow current to flow in one direction.

True or False?

A

False

They allow current to flow in both directions

27
Q

LEDs allow current to flow in one direction

True or False?

In the reverse direction, the current is very _____. In this direction the resistance is very __________

A

True

Low
Large

28
Q

Why can current only flow one way through a diode?

A

They contain semi-conductors which only allow current to flow through one way

29
Q

R = R + R +…

______ 1 2

A

Total

30
Q

The total resistance in series is the sum of …?

A

The individual resistances