# P4, Electrical Charges And Fields.

• Created by: cieran_10
• Created on: 13-10-18 21:24
Why are circuit symbols put together in a diagram?
To show how circuits are connected together.
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What is an electric current?
A flow of charge.
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What is charge carried by?
Electrons.
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What is the line on a current-potential difference graph for a filament bulb? What does it mean?
A curve. That the current is NOT directly proportional to the potential difference.
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Complete the sentence: the resistance of the filament lamp increases as the _________________ increases? Now say why?
Current. As the resistance of the filament increases as the temperature does.
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What makes no difference to the shape of the curve on a current-potnetial difference graph?
Reversing the p.d.
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What two factors will current NOT rely on?
The size of the current or the direction of it.
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What does the cureent-potential difference graph look like for a dioide?
It is line along the x-axis, which suddenly rises.
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In how many directions can current through a diode go?
One direction.
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Why is it that the current will be nearly 0 when the current goes in the opposite direction to how the diode goes?
As the resistance will be very high.
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What does an LED do?
It emits light when a current passes through it in the forward direction.
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What happens to the resistance of a thermistorwhen the temperature increases?
It will decrese,
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What happens to the resistance of an LDR (light-dependent resistor) as the light falling on it gets brighter?
The resistance decreses.
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Wh is it that the charge stops flowing everywhere if there is a break in a series circuit?
As the components are connected one after the other.
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What is the rule for the current of a series circuit? Why?
That the current through each component is the same. This is due to there being no alternative pathway for the for the charge.
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What is the current in a series circuit dependent on? (2.)
The p.d. of the power supply and the resistance.
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What is the rule for the p.d. of each component in a series circuit?
It is shared by all of the components.
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What is the rule for the total resistance of a series circuit?
That all of the resistance of each component add up to give the total resistance.
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Complete the sentence: the bigger the resistance of a component the bigger the share of its ________?
p.d.
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In a parallel circuit, how is each component connected? What does thsi mean?
Across the supply. This means that if there is a breakage in one branch of the circuit, then charge can still flow in the other branches/parts of the circuits.
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What is the rule for the p.d. of parallel circuits?
That it is the same across all of the components.
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What, in the components of parallel circuits, allow different amounts of charge to flow through difference components?
The different junctions.
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What does the current flowing through each component of a parallel circuit depend on?
The resistance.
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Complete the sentence: the bigger the resistance, the smaller the _______________ through a component?
Current.
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What is the rule for the total current of a parallel circuit?
It is the sum of the current of each separate branch.
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What is the rule for the total resistance of a parallel circuit?
It is that the total resistance of two or more of the components will be less than the resistance of the component with the least resistance.
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## Other cards in this set

### Card 2

#### Front

What is an electric current?

#### Back

A flow of charge.

### Card 3

#### Front

What is charge carried by?

### Card 4

#### Front

What is the line on a current-potential difference graph for a filament bulb? What does it mean?

### Card 5

#### Front

Complete the sentence: the resistance of the filament lamp increases as the _________________ increases? Now say why?