1. What type of charge does each of the following types of particle have?
(a) Electron
(b) Proton
(c) Neutron
2. Two positively charged objects are brought close to each other. What will they do?
3. Which of the following electric field diagrams is correct?
4. What unit is charged measured in? Look this up in your success guide if you’ve forgotten!
1. What type of charge does each of the following types of particle have?
(a) Electron Negative
(b) Proton
Positive
(c) Neutron Neutral (None)
2. Two positively charged objects are brought close to each other. What will they do?
They will repel each other.
3. Which of the following electric field diagrams is correct?
Electric field lines
always point
AWAY from a
positive charge
and TOWARDS a
negative charge
4. What unit is charged measured in? Look this up in your success guide if you’ve forgotten!
Coulombs (C)
1.
Fill in the missing spaces in the table below:
Quantity Name
Quantity Symbol
Unit Name
Unit Symbol
Charge
(a)
(d)
C
Current
(b)
(e)
A
Time
(c)
(f)
S
2.
What is the definition of an electrical current?
3.
Which of these equations is correct?
t = QI
4.
Q=t/I
Q = It
Q = I/t
I = Q2t
What happens to the current in a circuit when the same amount of charge
is moved around the circuit in a shorter period of time?
1.
2.
Fill in the missing spaces in the table below:
Quantity Name
Quantity Symbol
Unit Name
Unit Symbol
Charge
Q
Coulomb
C
Current
I
Ampere
A
Time
t
Second
s
What is the definition of an electrical current?
Current is defined as the rate of movement of charge.
This means that 1 ampere of current is the same as 1 coulomb per second.
3.
Which of these equations is correct?
t = QI
4.
Q=t/I
Q = It
Q = I/t
I = Q2t
What happens to the current in a circuit when the same amount of charge
is moved around the circuit in a shorter period of time?
The current in the circuit increases.
1.
Fill in the missing spaces in the table below:
Quantity Name
Quantity Symbol
Unit Name
Unit Symbol
(a)
Q
(b)
C
(c)
(d)
Second
(e)
(f)
I
Ampere
(g)
2.
A charge of 7 C passes through a lamp in a time of 5 s.
Calculate the current in the lamp.
3.
What name is given to a material in which the electrons are free to move
from atom to atom?
1.
Fill in the missing spaces in the table below:
Quantity Name
Quantity Symbol
Unit Name
Unit Symbol
Charge
Q
Coulomb
C
Time
t
Second
s
Current
I
Ampere
A
2. A charge of 7 C passes through a lamp in a time of 5 s.
Calculate the current in the lamp.
Q = It
7=Ix5
I = 7/5
I = 1.4 A
3.
What name is given to a material in which the electrons are free to move
from atom to atom?
A conductor
1.
Fill in the missing spaces in the table below:
Quantity Name
Quantity Symbol
Unit Name
Unit Symbol
Charge
Q
(c)
(d)
Current
(a)
Ampere
A
Time
(b)
Second
s
2.
There are three lamps in a simple series circuit. When a fourth lamp is
added, what happens to the current in the circuit?
3.
There are three lamps in a simple parallel circuit. When a fourth lamp is
added, what happens to the current in the main part of the circuit?
4.
Give an example of a non-metal which is still a conductor.
1.
2.
Fill in the missing spaces in the table below:
Quantity Name
Quantity Symbol
Unit Name
Unit Symbol
Charge
Q
Coulomb
C
Current
I
Ampere
A
Time
t
Second
s
There are three lamps in a simple series circuit. When a fourth lamp is
added, what happens to the current in the circuit?
The current decreases.
3.
There are three lamps in a simple parallel circuit. When a fourth lamp is
added, what happens to the current in the main part of the circuit?
The current increases.
4.
Give an example of a non-metal which is still a conductor.
Graphite
1. What is the definition of current?
Current is the rate at which charge is passing by a particular point in a circuit.
2. What are the values of the missing currents in the circuits below?
?
6A
?
3A
?
?
3. What is the definition of voltage?
The voltage (or potential difference) across a component is equal to the energy
given to (or removed from) each coulomb of charge that passes through that component.
1. What is the definition of current?
Current is the rate at which charge is passing by a particular point in a circuit.
2. What are the values of the missing currents in the circuits below?
3A
6A
6A
3A
3A
3A
3. What is the definition of voltage?
The voltage (or potential difference) across a component is equal to the energy
given to (or removed from) each coulomb of charge that passes through the component.
1.
Which physical quantity could be measured in coulombs per second?
Current
2.
Which physical quantity could be measured in joules per coulomb?
Voltage
3. A charge of 8.0 C passes through a lamp in a time of 12 s.
Calculate the current in the lamp.
Q = It
7=Ix5
I = 7/5
I = 1.4 A
3.
What is the speed (in metres per second) of the electrons in a typical wire?
3V
1.
Which physical quantity could be measured in coulombs per second?
Current (1 Ampere = 1 Coulomb per Second)
2.
Which physical quantity could be measured in joules per coulomb?
Voltage (1 Volt = 1 Joule per Coulomb)
3. A charge of 8.0 C passes through a lamp in a time of 12 s.
Calculate the current in the lamp.
Q = It
8 = I x 12
I = 8 / 12
I = 0.67 A
3.
What is the speed (in metres per second) of the electrons in a typical wire?
0.00003 m/s
(around 10 centimetres per hour)
1.
What unit is “charge” measured in?
Coulombs
2.
Which letter represents “current” in an equation?
I
3. A charge of 10 C passes through a lamp in a time of 5 s.
Calculate the current in the lamp.
Q = It
10 = I x 5
I = 10/5
I = 2.0 A
3.
A circuit consists of a 5 V battery connected in series to a lamp and a resistor.
The voltage across the lamp is 2 V. What is the voltage across the resistor?
3V
2 + VR = 5

VR = 5 – 2

VR = 3 V
1.
What unit is “charge” measured in?
Coulombs
2.
Which letter represents “current” in an equation?
I
3. A charge of 10 C passes through a lamp in a time of 5 s.
Calculate the current in the lamp.
Q = It
10 = I x 5
I = 10/5
I = 2.0 A
3.
A circuit consists of a 5 V battery connected in series to a lamp and a resistor.
The voltage across the lamp is 2 V. What is the voltage across the resistor?
3V
2 + VR = 5

VR = 5 – 2

VR = 3 V
1.
Which physical quantity could be measured in coulombs per second?
Current
2.
Which physical quantity could be measured in joules per coulomb?
Voltage
3. Sketch a graph of voltage against current for a filament lamp.
Q = It
7=Ix5
I = 7/5
I = 1.4 A
3.
What is the rule for (a) current and (b) voltage in a series circuit?
1.
Which physical quantity could be measured in coulombs per second?
Current
2.
Which physical quantity could be measured in joules per coulomb?
Voltage
Voltage / V
3. Sketch a graph of voltage against current for a filament lamp.
Q = It
7=Ix5
I = 7/5
I = 1.4 A
Current / A
3.
What is the rule for (a) current and (b) voltage in a series circuit?
(a) The current in the circuit is the same at all points
(b) The voltage across the components adds up to the voltage across the supply.