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Transcript
```Higher
Electricity
QUESTION 1
What is the definition of
electrical current?
QUESTION 2
What is the definition of
potential difference?
QUESTION 3
What is the definition of
electrical power?
QUESTION 4
Calculate the resistance
between X and Y.
QUESTION 5
When the switch closes, what
happens to the readings on the
ammeter and the voltmeter?
QUESTION 6
Calculate the resistance between
X and Y.
QUESTION 7
What is the purpose of Wheatstone
Bridge Circuits?
QUESTION 8
Wheatstone Bridge Circuit which
will indicate that it is balanced.
QUESTION 9
When Rv is increased from 10kΩ,
what will the graph look like of
V against ΔR?
QUESTION 10
Calculate the reading on the voltmeter
in the unbalanced Wheatstone Bridge
circuit shown below.
QUESTION 11
State the definition of EMF.
QUESTION 12
What is meant by a terminal
potential difference of 5V?
QUESTION 13
State the three variations of the
EMF equation.
QUESTION 14
Which two pieces of information can be
taken from the graph below when it cuts
the y-axis and the x-axis?
QUESTION 15
Find the internal resistance of the
battery from the graph below.
QUESTION 16
Calculate the reading on the ammeter,
when the switch is open and when the
switch is closed.
QUESTION 17
What is meant by the term
‘short circuit current’?
QUESTION 18
Under what conditions do you have
maximum power transfer in a circuit
from a battery with an internal
resistance r?
QUESTION 19
State the mains voltage and mains
frequency of the supply in the UK.
QUESTION 20
State the names of the controls on
an oscilloscope used to measure
a)Peak Voltage b)Frequency.
QUESTION 21
If the oscilloscope is set at 5V/div, then
calculate the peak voltage and the rms
voltage from the wave trace below.
QUESTION 22
If the oscilloscope is set at 10ms/div,
then calculate the frequency of the
wave trace below.
QUESTION 23
State two observations of the wave
trace below if the oscilloscope setting
is changed from 5ms/div to 20ms/div.
QUESTION 24
A peak current of 0.37A flows through
a lamp of resistance 885 Ω.
Calculate the power of the lamp.
QUESTION 25
Calculate the peak voltage and the peak
current from the circuit below.
QUESTION 26
What do capacitors store and what
type of circuits would you find them in?
QUESTION 27
State the unit for Capacitance and give
another unit which is equivalent to it.
QUESTION 28
State what is meant by a capacitor
having a capacitance of 3000µF.
QUESTION 29
A capacitor is marked 6V,120µF.
Calculate the maximum charge and
the maximum energy that it can
store.
QUESTION 30
If the capacitance and resistance are both
increased in the diagram below, then
sketch the new waveform produced.
QUESTION 31
Calculate the energy stored in the
capacitor below, when the voltage
across it is 8V.
QUESTION 32
QUESTION 33
What will happen to the readings on
each ammeter when the frequency of
both supplies are increased?
QUESTION 34
Name the process involved when
impurity atoms are added to form a
p-type or an n-type semiconductor
material.
QUESTION 35
Name the two types of bias that a
p-n material can be connected up in
with a battery.
QUESTION 36
State the charge present in p-type and
n-type semiconductor materials and
what type of charge carriers do they
both prefer?
QUESTION 37
Name component X, state the mode it is
operating in and describe how it will turn
the electric motor.
QUESTION 38
What difference is noticeable between
the conduction and valence bands in
semiconductors and insulators when
comparing them?
QUESTION 39
What happens to the band gap in a
semiconductor material when the
temperature increases?
QUESTION 40
Explain using Band Theory how
LED’s emit photons of light.
The End
```
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