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Summary OCR A level Physics A 4.2 Energy, power and resistance £6.99   Add to cart
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Summary OCR A level Physics A 4.2 Energy, power and resistance
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Summary notes for topic 4.2 Energy, power and resistance covering potential difference, electromotive force, resistance, circuit symbols, the electron gun, Ohm’s law, I-V characteristics, resistivity, thermistors, LDRs, power and paying for electricity . Notes include definitions, highlighted key...

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  • June 28, 2022
  • 10
  • 2021/2022
  • Summary

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I
+

"
_




, µ .
pi

battery LDÑ
"

switch to switch LÑ cell
^^
?


✓ ✓ ✓ ✓


diode resistor ʳTes%ʰ¥ Lamp LED


✓ ✓ ✓
-



✓


fuse voltmeter ammeter thermistor capacitor


Potential difference

Used to described when work is done
by charge carriers .




When electrical
energy is converted into other forms of
the
energy by in the
charge
circuit
carriers when
they lose
energy
to the
components .




Measured in volts .
One volt describes
joule of energy one

transferred per unit charge passing through the component
IV = IJC "

V V,
Wg
in volts V
potential difference
=
, ,




energy transferred joules J
W, ,
in ,


Q in coulombs C
,
charge , ,




Voltmeters are used to measure pd .
and are
always
connected in parallel across a
particular component .




An ideal voltmeter should have an infinite resistance so that
no current passes through it when connected .

, Electromotive force .




Used to describe when work charge carriers is done on the .




The
energy gained by the charge carriers they pass as


through a cell or
battery
to electrical
converted
as other
forms of energy ,

are
energy
.




The
energy transferred from chemical
energy for other)
to electrical unit
energy per charge
.




E
¥ E mf in volts V
=
e.
, , ,

J
energy transferred in joules
w, ,

Q, charge in coulombs C
, ,
.




The electron
gun
Metal filament heated by electric
•
current .




•
Electrons in filament gain kinetic
energy .




•

Meaning some escape from the metal .




•
thermionic emission emission of electrons -




through the action of
heat .




Vacuum + high p.cl filament
between anode make
filament
•
.
+

act like a cathode .




•
Electrons accelerate towards anode -




Electrons
gain kinetic energy
• .




•
If anode has a small hole electrons in line , pass through creating
,

a beam of electrons with specific kinetic
energy
.




Work done electron in kinetic
on an
gain energy
=




eV 1-2 my
2
=




elementary charge 11.6×10 a) in coulombs, C
'

e.
_




,

V,
accelerating p d. in volts V
.



, ,



M Mass . of an electron , in kilograms kg ,

*
' *
take
velocity , in metres per second Ms average speed
-




> an
V, ,

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