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Physics GCSE > Current Electricity (9) > Flashcards

Current Electricity (9) Flashcards

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0
Q

Wires are drawn as _____ lines

A

Straight lines

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1
Q

Components shoud NOT be positioned at _______

A

Corners

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2
Q

What is current

A

The flow of NEGATIVE charges around a circuit

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3
Q

What is current measured in? And what is the symbol?

A

Amps (A)

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4
Q

Does current flow from negative to positive or positive to negative

A

Positive to negative

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5
Q

Does current flow through the easiest route?

A

Yes

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6
Q

What instrument is used to measure current?

A

An ammeter

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7
Q

What can you say about the size of the current at any point in a series circuit?

A

It always stays the same

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8
Q

How do currents behave at a junction in a parallel circuit?

A

The current splits up. More of it will go down the easier route but it always has to split if there is a route it can take.

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9
Q

What does resistance do to current?

A

It slows it down

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10
Q

More resistance means…

A

It is harder for current to get through

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11
Q

What is a short circuit?

A

When the current can take a path of lower resistance to flow around its original circuit.

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12
Q

More components create more ___________

A

Resistance

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13
Q

Give 3 benefits of parallel circuits.

A
  • You can switch them off individually.
  • Lamps remain the same brightness.
  • If one lamp breaks then then the others still work
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14
Q

What is energy measured in and what is the symbol for it.

A

Joules (J)

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15
Q

What is voltage measured in and what is the symbol for it.

A

Volts (V)

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16
Q

What is resistance measured in and what is the symbol for it?

A

Ohms

Just imagine the symbol

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17
Q

2 problems with series circuits.

A
  • If one bulb breaks then none of them work.

* Bulbs go dimmer when more are added.

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18
Q

How do you work out the resistance of a particular component.

A

You measure the current through the component, using an ammeter

19
Q

More bulbs = ______ resistance = _______ current

A

More bulbs = more resistance = less current

20
Q

Fewer bulbs = ______ resistance = _______ current

A

Fewer bulbs = less resistance = more current

21
Q

An electric current flowing in a circuit can produce three energy changes in the circuit:

A

Chemical
Electrical
Light

22
Q

How do you measure the resistance of a resistor using the 3 colours

A

Colours = numbers
First colour = first number
Second colour = second number
Third colour = indicates the number of zeros

23
Q

What does a resistor do

A

Prevents too much current going through an appliance

24
Q

Why do we use resistors

A

They protect devices

25
Q

What is a variable resistor

A

A device that somebody can manually change the resistance of

26
Q

Example of a variable resistor

A 
Volume control
Dimmer switch (lighting)
27
Q

What does a thermistor do

A

As temperature increases resistance decreases (negative correlation)

28
Q

What does an LDR do

A

As light levels increase resistance decreases

29
Q

Where is a thermistor used

A

In a thermostat

30
Q

Where is an LDR used

A

Security lighting

31
Q

The current through a resistor at constant temperature is directly _______________ to the potential difference across the resistor

A

Directly proportional

32
Q

What is a ring main circuit

A

A circuit that provides a way of allowing several appliances in different parts of the same room to be connected to the mains using a minimum amount of wiring

33
Q

Ring circuits usually consist of 3 wires:

A

The live wire
The neutral wire
The earth wire

34
Q

For a diode, it’s forward resistance is _______ and it’s reverse resistance is ____________

A

Zero

Infinite

35
Q

What is the live wire

A

The wire that provides the path along which the electrical energy from the power station travel

36
Q

What is the neutral wire

A

The wire that completes the circuit

37
Q

Electrons flow easily through all ________

A

Metals

38
Q

In ______________ all the electrons are held tightly in position and are unable to move from atom to atom

A

Insulators

39
Q

What is the earth wire

A

The wire that protects you by making current flow back to the ground

40
Q

We measure electric charge (Q) in units called ___________ (__)

A

Coulombs (C)

41
Q

A voltmeter should be connected ‘across’ the _____________ being measured (in parallel)

A

Component

42
Q

Example of series circuit

A

Decorative lights (Christmas lights)

43
Q

As the charges flow around a circuit, the energy they carry is converted into other forms of energy by the components they pass through. The __________ across each component tells us how much energy it is _____________

A

Voltage

Converting

44
Q

Example of parallel circuit

A

Lighting in homes

45
Q

What is ohms law

A

The current that flows through a conductor is directly proportional to the potential difference across its ends, providing its temperature remains constant

Physics GCSE (22 decks)

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