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Physics 3rd form > Electricity > Flashcards

Electricity Flashcards

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1
Q

What charge are protons neutrons and electrons

A

Protons positive
Neutrons no charge
Electrons negative

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2
Q

What does the number of protons determine

A

The element it is

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3
Q

How do you charge by friction

A

You get a neutral cloth and a neutral balloon then rub the cloth and the balloon together and electrons transfer from the cloth to the balloon causing a negatively further balloon and a positively charged cloth

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4
Q

What is the law of electrostatics

A

Opposite charges attract each other

Like charges repell each other

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5
Q

Why does a persons hair stand up when they touch a van de Graf on plastic

A

The person is negatively charged because the van de Graf is putting negative charge in to our body’s and because the person is standing on a plastic stall which is an insulator the charges have no where to go so therefor the hair sticks up because like forces repell once you get off the charges go into the earth and you become neutral again

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6
Q

Out of electrons neutrons and protons which can move

A

Electrons negatively charged

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7
Q

What makes up the nucleus

A

Protons and neutrons

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8
Q

WHen you have induced charges what do forces always do

A

Attract

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9
Q

What is the first way of charging by induction

A

You get a negatively charged rod and a neutral metal can bring the rod near to the can and the electrons will go to one side of the can causing a charged can

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10
Q

What is the third way of charging by induction

A

You get a positively charged rod and a metal ball suspended from insulating string you bring the ball close to the rod with your hand and negative electrons come out of the ground into the ball because they are attracted by the rod and then you remove your hand from the ball and the ball is per a toy charged negatively

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11
Q

What is the second way of charging by induction

A

You get a neutral ball and a posotively charged object bring that close to the ball and the electrons will attract and go through you into the earth leaving you with a posotively charged ball

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12
Q

What is a current

A

The rate of flow of charge per second

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13
Q

What is current measured in

A

Amps A

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14
Q

How do you calculate the current

A

Current (A) = charge (c)

time (s)

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15
Q

What are the symbols for time current and charge

A

Time T
Current I
Charge Q

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16
Q

What is the current equation rearranged

A

T = Q
I

Q = I * T

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17
Q

In a series circuit what is the same all the way round

A

The current

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18
Q

What is a full scale deflection

A

The biggest reading on an ammeter

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19
Q

Do bulbs use current in series

A

No it is the same throughout the circuit in series

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20
Q

What happens to the current in a parallel circuit if you measure it before the branches and in the branches

A

The amount in the branches should always add up to what the current was before the circuit split

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21
Q

What happens to the battery when you add more bulbs

A

It rises

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22
Q

What happens to the current in parallel circuit when you have 2 branches one has one bulb and the other has two bulbs

A

The current in the branch that only has one is higher than the other branch with two bulbs so brighter but it still adds up to the current before the branches are there
Battery current does not split equally
Most current in the branch with least bulbs
The battery current splits in ratio of bulbs

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23
Q

What is the equation for voltage

A

Voltage = energy

Charge

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24
Q

What is the symbol equation for voltage

A

V = E

Q

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25
Q

What is voltage measured in

A

Volts

26
Q

What is the voltage equation rearrange

A

Charge = energy
Voltage
Energy = charge * voltage

27
Q

What other forms of voltage are there

A

Potential difference and EMF

28
Q

When is potential difference used

A

When talking about bulbs

29
Q

What does EMF stand for

A

Electro motive force

30
Q

How must you attach a voltmeter to a circuit

A

In parallel to the battery

31
Q

What does adding cells in series do to the voltage

A

Makes it more if the cells are casing the same way

32
Q

What are cells

A

Batteries

33
Q

When do we use emf

A

When referring to power sources

34
Q

What does the EMF equal in terms of potential difference

A

The sum of the potential difference

35
Q

What happens to the EMF in series circuit

A

The EMF in a series circuit is split between the two bulbs because if it wasn’t it would break the law of conservation wouldn’t work if you had a cell giving 6 J and both bulbs using 6 J because it would be creating energy

36
Q

What happens to the emf in a parallel circuit

A

In a parallel circuit the EMF is exactly the same as the potential difference the voltage is the same all the way round this doesn’t break the law of conservation because the charges only go through one of the bulb at a time

37
Q

What does a variable resister do

A

Alter the current

38
Q

Does the voltage and current characteristics of a resister obey ohms law

A

Yes it is directly proportional

39
Q

What does directly proportional look like on a graph

A

A straight line going through the origin

40
Q

What is ohms law

A

For a fixed resistor resistor the potential difference and current or directly proportional to each other if external factors(temp) do not change

41
Q

What is he equation for resistance

A

R = v

I

42
Q

What is resistance measured in

A

Ohms

43
Q

What is the resistance eqauation rearranged

A

V = R * I
I = v
R

44
Q

What is inversely proportional

A

When you double something like R you have to half your I when the voltage is the same

45
Q

How is resistance caused

A

By collisions between electrons and the iron lattice.

46
Q

How can you tell if a graph does not obey ohms law

A

If it is curved

47
Q

What happens to the resistance if you increase the current in the bulb

A

It increases

48
Q

Does a diode obey ohms law

A

No it is curved

49
Q

Can current flow any way through a diode

A

No only one way

50
Q

What is a thermistor

A

It is a heat resistor and is used in thermometers

51
Q

What happens to the R when the temp increase

A

It drops

52
Q

Is Funster directly proportional or inversely proportional

A

It isn’t any of them

53
Q

What happens to the ammeter when the thermistor gets hot

A

It rises

54
Q

Where is a light dependent resistor used

A

In a street light when the Sun goes down it detects it in turns on the light

55
Q

What happens to the resistance when the light dependent resistor Goshen bright to dark

A

It rises

56
Q

What happens to the resistance if you add resistors in a series circuit

A

It increase the same amount each time for 1 resistor 120 ohms 2 resistors 240 ohms 3 resistors 360 ohms

57
Q

What happens to the resistance if you add resistors in parallel circuit

A

The total resistance decreases

58
Q

How do you calculate the total resistance in a parallel circuit where all the resistors have the same resistance

A

Resistance of each one

Number of resistors

59
Q

How do you calculate the total resistance in a series circuit when the resistors are different

A

R1 + R2 = total resistance

60
Q

How do you calculate the total resistance in a parallel circuit when the resistors are different

A

Total resistance = r * r

r + r

Physics 3rd form (2 decks)

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