Electrical power is transmitted from Norway to Britain using a cable laid under the
North Sea.
The following information is published on a website.
The cable has a diameter of 15 cm and a length of 720 km.
It is made of copper of resistivity 1.7 × 10–8 Ω m.
The electrical power transmitted from Norway is 1400 MW and the transmission potential
difference is 1100 kV.
The efficiency of this process is almost 100%.
Deduce, by calculation, whether the claim for efficiency is correct.
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(Total for Question 12 = 6 marks)
*P74468A0824*
Question
Physics
Edexcel2024
P74468A 3
*P69442A02732*
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Turn over
PMT
Electric circuits Waves and particle nature of light
Potential difference Wave speed
W
v = f λ
V =
Q
Speed of a transverse wave on a string
Resistance
T
V v =
R = μ
I
Intensity of radiation
Electrical power and energy
P
P = VI I =
A
P = I 2R
Power of a lens
V 2
P = 1
R P =
f
W = VIt
P = P + P + P + …
P =
t
v2 = u2 + 2as W
P =
t Forces
useful energy output
efficiency =
∑F = ma
total energy input
F
g = useful power output
m efficiency =
total power input
W = mg
moment of force = Fx
Momentum
p = mv
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*P71915A02428*
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IN
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AREA
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AREA
AERA
SIHT
NI
ETIRW
TON
OD
AERA
SIHT
NI
ETIRW
TON
OD
AERA
SIHT
NI
ETIRW
TON
OD
PMT
Electric circuits Waves and particle nature of light
Potential difference Wave speed
W
v = f λ
V =
Q
Speed of a transverse wave on a string
Resistance
T
V v =
R = μ
I
Intensity of radiation
Electrical power and energy
P
P = VI I =
A
P = I 2R
Power of a lens
V 2
P = 1
R P =
f
W = VIt
P = P + P + P + …
Question
Physics
Edexcel2022
*P69306A02528*
Turn over
PMT
Electric circuits Waves and particle nature of light
Potential difference Wave speed
W
v = f λ
V =
Q
Speed of a transverse wave on a string
Resistance
T
V v =
R = μ
I
Intensity of radiation
Electrical power and energy
P
P = VI I =
A
P = I 2R
Power of a lens
V 2
P = 1
R P =
f
W = VIt
P = P + P + P + …
Question
Physics
Edexcel2021
*P67096A02932*
PMT
Electric circuits Waves and particle nature of light
Potential difference Wave speed
W
v = f λ
V =
Q
Speed of a transverse wave on a string
Resistance
T
V v =
R = μ
I
Intensity of radiation
Electrical power and energy
P
P = VI I =
A
P = I 2R
Power of a lens
V 2
P = 1
R P =
f
W = VIt
P = P + P + P + …
Question
Physics
Edexcel2020
*P61864RA02628*
PMT
Electric circuits Waves and particle nature of light
Potential difference Wave speed
W
v = f λ
V =
Q
Speed of a transverse wave on a string
Resistance
T
V v =
R = μ
I
Intensity of radiation
Electrical power and energy
P
P = VI I =
A
P = I 2R
Power of a lens
V 2
P = 1
R P =
f
W = VIt
P = P + P + P + …