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?

Back

Card 4

Front

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

Back

Card 5

Front

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

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