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WorksheetsSTC P3 Electricity
Total questions: 63
Worksheet time: 2hrs 30mins
What is the best definition for potential difference?
the potential energy per electron.
the potential energy per unit of charge.
the kinetic energy per unit of charge.
the energy carried by an electron.
The diagram shows a temperature sensing circuit used to control a heating system in a house.
What quantity does the ammeter measure? (One correct word only needed)
(a)
What are the units for current?
Amps
Volts
Coulombs
Watts
What is the unit of power?
Amps
Volts
Coulombs
Watts
What is the unit of charge?
Amps
Volts
Coulombs
Watts
What is the unit of potential difference?
Amps
Volts
Coulombs
Watts
This is an example of a _______ circuit
open
series
parallel
closed
This is an example of a ______ circuit
Series
Parallel
Open
Closed
The graph shows the change in current with potential difference for
an LED
a filament lamp
a diode
a thermistor
To calculate the resistance of the component at a particular potential difference you
read the current at that point on the graph and calculate p.d divided by current
draw a tangent to the line at that point and calculate the gradient
draw a tangent to the line at that point and calculate 1/gradient
read the current at that point on the graph and calculate current/p.d
The resistance of the component
is always constant as the p.d. increases
starts high and then decreases as the p.d. increases
starts constant for low values of p.d. and then increases as the p.d. increases
starts constant for low values of p.d. and then decreases as the p.d. increases
Which component has the highest resistance?
1
2
The components 1 and 2 which produced this IV graph are:
Resistors
Filament lamps
Diodes
A combination of the above
Where would you place an ammeter in the circuit?
Green ?
Red ?
Where would you place a voltmeter in the circuit?
Green ?
Red ?
What is the relationship between the readings on Ammeters A1, A2 and A3
A1 = A2 + A3
A3 = A1 + A2
A1 = A2 = A3
A3 = A1-A2
What is the relationship between the readings on Ammeters A1, A2 and A3?
A1 = A2 = A3
A1 = A2 - A3
A3 = A1 + A2
A3 = A1 - A2
This is an example of a _________ circuit
series
parallel
The reading on Voltmeter V1 is
15V
6V
9V
12V
The reading on Voltmeter V2 is
15V
6V
9V
3V
The reading on the voltmeter is
3 V
6 V
12 V
Can not answer as need to know the resistance of the bulb.
Which of the following statements is true?
V1 + V2 + V3 is equivalent to the emf of the cell
V1 + V2 - V3 is equivalent to the emf of the cell
V2 = V3
V1 = V3
What quantities are changed in a step-up transformer?
Voltage increases
Voltage decreases
Current increases
Current decreases
What type of transformer increases voltage?
Step-Up
Step-Down
Why is the voltage increased in the national grid?
Stops electricity being lost.
Stops energy loss by heat
To increase safety
Stops energy loss through leaking electricity
Which images shows the voltage trace for a.c?
Which of the following is the symbol for LDR?
What does LDR stand for?
Light dependent resistor
Light emitting diode
Light emitter resistor
Light diode resistor
Which of the following is an application of LDR?
Used in light sensitive circuit
Used in heat sensitive circuit
Used in rectifier circuit
Used in amplifier circuit
What happens to the resistance of LDR when the light intensity increases?
increases
decreases
does not change
first increases then decreases
What happens to the ammeter reading when the light intensity increases?
increases
decreases
does not change
first increases then decreases
This is a graph for which component?
LDR
Thermistor
Diode
Resistor
Filament lamp
At high temperatures, the resistance is .....
High
Low
At low temperatures, the resistance is ...
High
Low
As the temperature increases, the resistance
increases
decreases
What is the correct symbol for a thermistor?
