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KA S3 Physics > 4. Electricity > Flashcards

4. Electricity Flashcards

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1
Q

Where are protons found in the atom?

A

Inside the nucleus

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2
Q

Where are neutrons found inside the atom?

A

Inside the nucleus

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3
Q

Where are electrons found inside the atom?

A

The orbit around the outside of the nucleus.

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4
Q

What is the charge of a proton in units of e?

A

+1 (e)

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5
Q

What is the charge of an electron in units of e?

A

-1 (e)

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6
Q

What is the charge of a neutron in units of e?

A

0 (e)
It is electrically neutral

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7
Q

When an object loses electrons, what happens to its charge?

A

It becomes positively charged

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8
Q

When an object gains electrons, what happens to its charge?

A

It becomes negatively charged

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9
Q

Why do objects become charged?

A

Objects become charged due to the transfer of electrons.

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10
Q

What is charge measured in?

A

Coloumbs (C)

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11
Q

What is the charge of an electron?

A

-1.6x10-19 C

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12
Q

What is the charge of a proton?

A

+1.6x10-19 C

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13
Q

What is the definition of current?

A

An electrical current is the flow of electrons in a circuit.

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14
Q

What is the symbol for charge?

A

Q

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15
Q

What is the symbol for current?

A

I

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16
Q

What is the symbol for time?

A

t

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17
Q

What is the standard unit for current?

A

A (Amps)

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18
Q

What is the standard unit for time?

A

s (seconds)

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19
Q

What is an electric field?

A

An electric field is the region around a charged particle or object within which a force would be exerted on another object.

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20
Q

What is the rule for the direction of the arrows used to denote an electric field?

A

Electric field direction arrows are always in the direction a positive charge would follow.

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21
Q

What can we tell from the closeness of electric field arrows?

A

How weak or strong an electric field is.

Arrows close - strong
Arrows far apart - weak

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22
Q

What type of charge is shown?

A

Negative

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23
Q

What type of charge is shown?

A

Positive

24
Q

What types of charge are shown?

A

Left - positive
Right - negative

25
Q

What tpyes of charge are shown?

A

Both are positive

26
Q

What is the definition of voltage?

A

Voltage is the amount of energy given to each coloumb of charge.

27
Q

What is the symbol for voltage?

A

V

28
Q

What are the units for voltage?

A

V (Volts)

29
Q

What is the potential difference across these parallel plates?

A

25 V

30
Q

Define direct current.

A

Direct current flows in one direction around a circuit
i.e. the current flows from negative to positive.

31
Q

Define alternating current.

A

Alternating current repeatedly changes direction around a circuit each second

32
Q

What is a source of direct current?

A

Batteries

33
Q

What is a source of alternating current?

A

Anything that uses the mains supply.

34
Q

What is the declared voltage of the UK mains supply?

A

230 V

35
Q

What is the declared frequency of the UK mains supply?

A

50 Hz

36
Q

What is this the circuit symbol for?

A

Bulb

37
Q

What is this the circuit symbol for?

A

LED (Light Emitting Diode)

38
Q

What is this the circuit symbol for?

A

Battery (always need at least 3 dashes!)

39
Q

What is this the circuit symbol for?

A

Resistor

40
Q

What is this the circuit symbol for?

A

Cell

41
Q

What is this the circuit symbol for?

A

Photodiode

42
Q

What is this the circuit symbol for?

A

Motor

43
Q

What happens to current in a series circuit?

A

Current is THE SAME at all points in a series circuit.

44
Q

What happens to voltage in a series circuit?

A

The supply voltage SPLITS across all the components in a series circuit.

45
Q

What happens to current in a parallel circuit?

A

Current SPLITS across all the branches of a parallel circuit.

46
Q

What happens to voltage in a parallel circuit?

A

All branches recieve the supply voltage in a parallel circuit.

47
Q

What is the definition of resistance?

A

Resistance is the opposition to the flow of current.

48
Q

What is the symbol for resistance?

A

R

49
Q

What is the unit for resistance?

A

Ω (Ohms)

50
Q

What do you use to measure resistance?

A

Ohmmeter

51
Q

How do you place an ohmmeter into a circuit?

A

You place is directly accross the component.

52
Q

What do you use to measure the voltage across a component?

A

Voltmeter

53
Q

How do you place a voltmeter into a circuit?

A

You place it directly across the component.

54
Q

What do you use to measure current in a circuit?

A

Ammeter

55
Q

How do you place an ammeter into a circuit?

A

You place it inbetween components.

56
Q

How does the length of a wire affect resistance?

A

The longer the wire, the more resistance there is.

57
Q

How does the thickness of a wire affect resistance?

A

The thicker the wire, the less resistance there is.

KA S3 Physics (5 decks)

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