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KA S3 Physics > 4. Electricity > Flashcards

4. Electricity Flashcards

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?

24
Q

What types of charge are shown?

A

Left - positive
Right - negative

25
What tpyes of charge are shown?
Both are positive
26
What is the definition of voltage?
Voltage is the amount of energy given to each coloumb of charge.
27
What is the symbol for voltage?
V
28
What are the units for voltage?
V (Volts)
29
What is the potential difference across these parallel plates?
25 V
30
Define direct current.
Direct current flows in one direction around a circuit i.e. the current flows from negative to positive.
31
Define alternating current.
Alternating current repeatedly changes direction around a circuit each second
32
What is a source of direct current?
Batteries
33
What is a source of alternating current?
Anything that uses the mains supply.
34
What is the declared voltage of the UK mains supply?
230 V
35
What is the declared frequency of the UK mains supply?
50 Hz
36
What is this the circuit symbol for?
Bulb
37
What is this the circuit symbol for?
LED (Light Emitting Diode)
38
What is this the circuit symbol for?
Battery (always need at least 3 dashes!)
39
What is this the circuit symbol for?
Resistor
40
What is this the circuit symbol for?
Cell
41
What is this the circuit symbol for?
Photodiode
42
What is this the circuit symbol for?
Motor
43
What happens to current in a series circuit?
Current is THE SAME at all points in a series circuit.
44
What happens to voltage in a series circuit?
The supply voltage SPLITS across all the components in a series circuit.
45
What happens to current in a parallel circuit?
Current SPLITS across all the branches of a parallel circuit.
46
What happens to voltage in a parallel circuit?
All branches recieve the supply voltage in a parallel circuit.
47
What is the definition of resistance?
Resistance is the opposition to the flow of current.
48
What is the symbol for resistance?
R
49
What is the unit for resistance?
Ω (Ohms)
50
What do you use to measure resistance?
Ohmmeter
51
How do you place an ohmmeter into a circuit?
You place is directly accross the component.
52
What do you use to measure the voltage across a component?
Voltmeter
53
How do you place a voltmeter into a circuit?
You place it directly across the component.
54
What do you use to measure current in a circuit?
Ammeter
55
How do you place an ammeter into a circuit?
You place it inbetween components.
56
How does the length of a wire affect resistance?
The longer the wire, the more resistance there is.
57
How does the thickness of a wire affect resistance?
The thicker the wire, the less resistance there is.

KA S3 Physics (5 decks)

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