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Physics 9-1 iGCSE Oxford AQA > Electrical Circuits > Flashcards

Electrical Circuits Flashcards

1
Q

What is current?

A

Current is the flow of electric charge

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2
Q

When will current only flow?

A

Will only flow around a complete (closed) circuit if there’s a potential difference

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3
Q

What is the unit for current?

A

ampere, A

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4
Q

In a series circuit, current has the … value current everywhere in circuit

A

In a series circuit, current has the same value current everywhere in circuit

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5
Q

What is potential difference (voltage)?

A

Is the driving force that pushes charge around

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6
Q

What is the unit for pd?

A

volt, V

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7
Q

What is resistance?

A

Anything in a circuit that slows the flow down

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8
Q

What is unit for resistance?

A

ohm, Ω

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9
Q

What happens to the current if you increase the resistance across a component?

A

Less current will flow through it (for a given potential difference across the component)

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10
Q

Draw the circuit diagram symbol for a cell

A
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11
Q

Draw the circuit diagram symbol for a battery

A
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12
Q

Draw the circuit diagram symbol for an open switch

A
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13
Q

Draw the circuit diagram symbol for a closed switch

A
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14
Q

Draw the circuit diagram symbol for a filament lamp/bulb

A
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15
Q

Draw the circuit diagram symbol for a fuse

A
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16
Q

Draw the circuit diagram symbol for a LED

A
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17
Q

Draw the circuit diagram symbol for a resistor

A
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18
Q

Draw the circuit diagram symbol for a variable resistor

A
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19
Q

Draw the circuit diagram symbol for an ammeter

20
Q

Draw the circuit diagram symbol for a voltmeter

21
Q

Draw the circuit diagram symbol for a diode

22
Q

Draw the circuit diagram symbol for a LDR

23
Q

Draw the circuit diagram symbol for a thermistor

24
Q

What happens when a bigger current flows through a circuit

A

More charge passes around circuit

25
State the units for this equation Q = It (Charge = Current x Time)
Current = amperes (A) Charge = coulombs (C) Time = seconds (s)
26
What is Ohm's Law?
Current through a resistor is proportional to the potential difference provided the temperature is constant
27
Does resistance of ohmic conductors (e.g. Wire or resistor) change with current?
No
28
Why does resistance of filament lamps change?
1. When an electrical charge flows through a filament lamp, it transfers some energy to thermal energy store of filament (designed to heat up) 2. As current increases, filament lamp heats up more and resistance increases
29
Why does resistance in diodes change?
They let current flow in one direction, but have a very high resistance if it's reversed
30
Explain how increasing the temperature of component, increases the resistance?
Metal ions in wire will have more energy = more collisions with electrons = more resistance
31
In a LDR, as light intensity increases, resistance...
decreases
32
Draw a graph for a LDR
33
In a thermistor, as temperature increases, resistance...
decreases
34
Draw a graph for thermistor
35
In a series circuit, if you remove or disconnect one component, what will happen?
The circuit is broken and they all stop
36
What are series circuit good for?
To measure quantities and test components
37
In a series circuit, potential difference is...
shared
38
In a series circuit, current is...
the same
39
In a series circuit, total resistance...
is the sum of the resistance of each component
40
In a parallel circuit, potential difference is...
the same
41
In a parallel circuit, current is...
shared
42
At junctions, in a parallel circuit, current either...
splits or rejoins
43
Adding a resistor in parallel, has what effect on the total resistance?
It reduces the total resistance
44
Explain why if you add 2 resistors in parallel, their total resistance is less than resistance of the smallest of the 2 resistors
1. In parallel, both resistors have same potential difference across them as the source 2. 'Pushing Force' making current flow is the same as source of potential difference for each resistor that you add 3. By adding another loop, current has more than one direction to go in 4. Increasing total current that can flow around circuit. Using V = IR, an increase in current means a decrease in total resistance of circuit
45
How do you work out the total resistance of parallel circuit when there's 2 resistors?
46
How do you work out the total resistance of parallel circuit when there's more than 2 resistors?
47
What do you need to remember for resistance in a parallel circuit?
The combined resistance is less than that if either component

Physics 9-1 iGCSE Oxford AQA (12 decks)

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