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Year 10 Physics - Mine > Electricity > Flashcards

Electricity Flashcards

1
Q

What is current

A

A flow of electrical energy

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2
Q

Increasing the flow of current has the effect of what

A

Faster, brighter and warmer

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3
Q

What is electric current measured in

A

Amperes or amps (A)

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4
Q

How do you measure current

A

Using an ammeter

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5
Q

When testing different materials what does a conductor allow

A

Electric current to flow through it

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6
Q

When testing materials what doesn’t an insulator allow

A

Electric current to flow through it

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7
Q

For an electrical current to flow what do we need

A

A complete circuit

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8
Q

What is the flow of current in a series circuit

A

The same

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9
Q

In a simple series circuit where is everything connected

A

In one loop across the terminals of the battery. So there aren’t any points where the current can spilt or join (these are called junctions)

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10
Q

Current in a series circuit summary:

Talk about the current as different positions in the circuit

A

The current at different positions in the circuit, before and after the resistor, was the same. Current is not used up by the components in the circuit

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11
Q

Current in a series circuit summary:

What is current not used up by

A

By the components in the circuit

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12
Q

Current in a series circuit summary:

What happened when you increased the number of components in the circuit

A

It decreased the current. The current at all points in a series circuit is the SAME

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13
Q

What is the current like at all points in a series circuit

A

The same

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14
Q

Current in a series circuit summary:

Tell me about current flow in a series circuit

A

When we talk about current flowing, we say that current flows out of the cell and back into the negative terminal

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15
Q

Current in a series circuit summary:

Tell me about conventional current

A

Conventional current flows from the positive pole to the negative pole. It has the same value at any point in the circuit

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16
Q

Current in a series circuit summary:

What is the value of conventional current at any point in the circuit

A

It has the same value

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17
Q

Current in a series circuit summary:

Tell me about electron flow

A

The electrons flow from the negative side of the battery to the positive side. These are the particles that are actually moving through the conductor

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18
Q

Current in a series circuit summary:

What is the difference between the electrons in a circuit flow compared to conventional current

A

The electrons in a circuit flow from the negative pole to positive pole. The opposite direction to conventional current

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19
Q

What is voltage

A

The amount of push

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20
Q

How do we measure voltage across a resistor or a bulb

A

Voltage is measured by connecting the voltmeter across (or in PARALLEL with) the COMPONENT. Voltage is measured in volts and the symbol for this is V

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21
Q

What are components

A

Resistors or bulbs

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22
Q

Fill in the blanks:
Remember we are still talking about series circuits!!
The current is the….of energy around the circuit. The voltage is the amount of….

A

Flow

Push

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23
Q

Fill in the blanks:
REMEMBER WE ARE TALKING ABOUT SERIES CIRCUITS.
when two components were put into circuit 2, the voltage of the supply was the…..as circuit one. However, the voltage across R1……..

A

Same

Decreased

24
Q

Fill in the blanks:
REMEMBER we are still talking about series circuits
The………across both components in circuit 2……to be……to the supply voltage

A

Voltage
Added
Equal

25
Q

What is a parallel circuit

A

A parallel circuit is one that contains a point (a junction) where the current can split (point a) or join (point b)

This means there is more than one path around the circuit

26
Q

How many oaths are there around a parallel circuit

A

More than 1

27
Q

For a parallel circuit, the current that leaves the cell is what in comparison to the current that returns to the cell

A

The same

28
Q

What does the current get used by in a parallel circuit

A

The current does NOT get used by the circuit, just the energy that the electrons are carrying

29
Q

Give a summary of parallel circuits

A

The sum of the current in the branches is equal to the current that leaves the cell

The voltage across each branch is equal

30
Q

Electricity and magnetism full summary:

What is the flow of current

A

The movement of electrical charge, usually electrons

31
Q

Electricity and magnetism full summary:

Where do electrons move from and where to

A

Electrons move from the negative terminal of a cell to the positive terminal of a cell

32
Q

Electricity and magnetism full summary:

What is conventional current flow like

A

It’s from positive to negative

33
Q

Electricity and magnetism full summary:

In a series circuit what does the current split into

A

Continuous loops

34
Q

Electricity and magnetism full summary:

In a parallel circuit what does the current split into

A

Into separate branches

35
Q

Electricity and magnetism full summary:

What is a short circuit like for electrons to flow

A

It’s a very easy route for electrons to flow

36
Q

Electricity and magnetism full summary:

Explain the resistance to current of an insulator and a conductor

A

An insulator has a very high resistance to current and a conductor has a low resistance to current

37
Q

Electricity and magnetism full summary:

What does an ammeter measure current in and what does a voltmeter measure PD and EMF in

A

An ammeter measures current in amps and a voltmeter measures PD and EMF in volts

38
Q

Current flows easily through a short circuit but what does it not flow easily through

A

An insulator and conductor

39
Q

An ammeter measures what and must be placed where

A

It measures current and must be placed in a circuit

40
Q

What does a voltmeter measure and where must it be placed

A

A voltmeter measures PD and EMF in volts and must be placed in the component of a circuit

41
Q

What units do ammeters and voltmeters measure in

A

Ammeter - amps

Voltmeter - volts

42
Q

Electricity and magnetism 2:
Fill in the blanks;
In a rheostat the resistance can be…… A…..will allow current to flow in……………. When light shines on a LDR many……..are released. The……..the resistance of a wire, the…..the……. In an AND gate both switches must be….to get an……. In an OR gate only…..input must be on to get an…….

A 
Variable
Diode
One direction 
Electrons
Higher
Less
Current
On
Output
One
Output
43
Q

Electrons moving round a circuit constitute what

A

A current

44
Q

What do electrons carry

A

Energy in the form of charge

45
Q

In an electron, the faster the flowing charge, the what

A

The larger the current

46
Q

If Q=It

What does I equal

A

I = Q/t

47
Q

In the equation Q=It

What does the Q, I, t stand for

A

Q is the charge measured in coulombs, C.
I is the current flowing, ampères or amps, A.
t is time in seconds/s

48
Q

Resistor networks:

In series…..

A

Just add them together

49
Q

Resistor networks:

In parallel……

A

Resistors in parallel create lower resistance than when the resistors are connected in series

50
Q

1/Rparallel = what

A

1/R1 + 1/R2

Could write as….

  1                      1                 1 ---------      =  -----     +   ----- Rparallel             R1               R2
51
Q

How do we study the effect in voltage across a resistor

A

This is done using the 2 meter method

52
Q

If you have a graph showing voltage and current which has the results of a straight line through the origin what does it mean

A

This means that voltage is directly proportional to current (origin, positive correlation, straight line)

53
Q

Plotting a graph of voltage V against current I, (y against x, or dependent against independent variable) gives a slope gradient of what

REMEMBER THE GRAPH IS ABOUT CURRENT AND VOLTAGE

A

R. The steeper the slope the greater the resistance, the less steep the slope the smaller the resistance

54
Q

A component that gives a straight line graph is called what

A

An ohmic conductor

55
Q

What metals give a straight line graph when measuring voltage and current

A

Copper wire and most other metals give this shape of graph, unless they change temperature

56
Q

What is the definition of Ohm’s law

A

The voltage across an ohmic conductor is directly proportional to the current though it at constant temperate

57
Q

Put this equation in to words

V=IR

A

Voltage = current X resistance

Year 10 Physics - Mine (1 decks)

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