Transcript `Millionaire` Electricity and Electromagnetism revision PowerPoint

Who Wants To Be
A Millionaire?
Electricity
and
Magnetism
Question 1
An ammeter is used for
measuring
A
B
C
D
Electrical charge
Circuit temperature
Electrical current
Potential difference
Answer
A
B
C
D
Electrical charge
Circuit temperature
Electrical current
Potential difference
£100
Question 2
Brushes on an electric
motor connect to the
A
B
C
D
commutator
communitarianist
communist
commentator
Answer
A
B
C
D
commutator
communitarianist
communist
commentator
£200
Question 3
Doubling the number of
turns on a solenoid will
A
Increase the magnetic force
B
Increase the current
C
Decrease the magnetic force
D
Increase the voltage
Answer
A
Increase the magnetic force
B
Increase the current
C
Decrease the magnetic force
D
Increase the voltage
£300
Question 4
I kWh of electrical energy costs
5p. What is the cost of running a
10 kW oven for 5 hours?
A
B
C
D
£5
£25
25p
£2.50
Answer
A
B
C
D
£5
£25
25p
£2.50
£500
Question 5
A copper wire carrying
an electrical current
A Has no magnetic field around it
B Has a magnetic field around it
C
Only has a north pole
D
Only has a south pole
Answer
A Has no magnetic field around it
B Has a magnetic field around it
C
Only has a north pole
D
Only has a south pole
£1,000
Question 6
Which of the following is the
correct rule for electric
motors?
A
Fleming’s right hand rule
B
C
The right hand grip
The left hand grip
D
Fleming’s left-hand rule
Answer
A
Fleming’s right hand rule
B
The right hand grip
The left hand grip
C
D Fleming’s
left-hand rule
£2,000
Question 7
The resistance value of two
10 Ω resistors in parallel is
A
B
C
D
0.5 Ω
20 Ω
5Ω
2Ω
Answer
A
B
C
D
0.5 Ω
20 Ω
5Ω
2Ω
£4,000
Question 8
The relationship between
voltage and current in
Ohm’s law is
A
B
C
D
V=IxR
R= V x I
I=VxR
V = I/R
Answer
A
B
C
D
V=IxR
R= V x I
I=VxR
V = I/R
£8,000
Question 9
Which one is wrong:
‘A current in a wire is induced when’
A a wire is moved between the poles of a magnet
B a coil is moved to and fro across a wire
C a magnet is moved in and out of a coil
D a wire moves faster and faster in a magnetic field
Answer
A a wire is moved between the poles of a magnet
B a magnet is moved in and out of a coil
C a coil is moved to and fro across a wire
D a wire moves faster and faster in a magnetic field
£16,000
Question 10
The value of the secondary
voltage in a transformer is
calculated using
A
B
C
D
V xV = N x N
V/N =N /V
V /V =N /N
V x I =V x I
s
p
s
p
s
p
s
p
s
p
s
p
p
p
s
s
Answer
A
B
C
D
V xV
V/N
V /V
V xI
s
p
s
p
s
p
p
p
=N xN
=N /V
=N /N
=V x I
s
p
s
p
s
s
p
s
£32,000
Question 11
High voltage AC is used to
transmit electrical power
because
A
Heat loss is inversely proportional to the current
B Transformers heat up more with DC
C Heat loss is proportional to the current squared
D Low voltage produces more heat
Answer
A
Heat loss is inversely proportional to the current
B Transformers heat up with DC
C Heat loss is proportional to the current
D Low voltage produces more heat
£64,000
Question 12
A device that relies upon
eddy currents is
A
B
C
D
A generator
A metal detector
A loudspeaker
A transformer
Answer
A
B
C
D
A generator
A metal detector
A loudspeaker
A transformer
£125,000
Question 13
This AC generator’s
electrical output
shows that the rotor
was rotated how
many times?
A
B
C
D
Once
Twice
Three times
Four times
Answer
A
B
C
D
Once
Twice
Three times
Four times
£250,000
Question 14
Three-phase output from a
power station alternator
results from
A 3 Stator and rotor coil wire thicknesses used
B 3 different speeds of rotation are sequenced
C 6 stator coils and 6 rotor coils are set at 60o in the
plane of rotation
D 3 stator coils and 3 rotor coils are set at 120o in the
plane of rotation
Answer
A 3 Stator and rotor coil wire thicknesses are used
B 3 different speeds of rotation are sequenced
C 6 stator coils and 6 rotor coils are set at 60o in the
plane of rotation
D 3 stator coils and 3 rotor coils are set at 120o in the
plane of rotation
£500,000
Question 15
Temp
sensor
Light
sensor
A
B
C
D
NOT
gate
To turn the heater ON the Temp
sensor and Light sensor must be
AND
gate
Heater
control
Temp 1, Light 1
Temp 0, Light 0
Temp 0, Light 1
Temp 1, Light 0
Answer
A
B
C
D
Temp 1, Light 1
Temp 0, Light 0
Temp 0, Light 1
Temp 1, Light 0
£1,000,000