ELECTRICAL UNITS
Match up correctly:
CURRENT (C)
Joules
Ω
VOLTAGE (V)
Ohms
A
RESISTANCE (R)
Coulombs
J
POWER (P)
Volts or Joules/coulomb
W
CHARGE (????)
Amps or Coulombs/second
V
ENERGY (E)
Watts or Joules/second
C
Once you have done this – write down as many symbol equations as you can remember
for this unit
ELECTRICAL UNITS
Match up correctly:
CURRENT (C)
Joules
Ω
VOLTAGE (V)
Ohms
A
RESISTANCE (R)
Coulombs
J
POWER (P)
Volts or Joules/coulomb
W
CHARGE (????)
Amps or Coulombs/second
V
ENERGY (E)
Watts or Joules/second
C
Once you have done this – write down as many symbol equations as you can remember
for this unit
The Equations
•
•
•
•
•
Q=Cxt
V=CxR
E=VxQ
E=Pxt
P=VXC
V
CxR
Q
E
VxQ
Cxt
E
Pxt
P
VxC
Where do they all come from?
Electricity
• Revise the concept of charge and current
• Revise the concept of voltage and energy
• Revise the concept of Parallel and Series
Circuits
• Back to the equations
Q=Cxt
Q
Cxt
Back to the equations
• Charge = Current x Time
V=CxR
V
CxR
Back to the equations
• Voltage = Current x Resistance
• Remember VCR
E=VxQ
E
VxQ
Back to the equations
• Energy = Voltage (pd) x Charge
• One Volt = One Joule given to
One Coulomb of Charge
E=Pxt
E
Pxt
• Energy = Power x Time
• The Power is the rate at which
energy is transferred
A Kettle uses 2300 Watts of power. If it is switched on for 5 minutes how much energy
does it use?
Back to the equations
P=VxC
Q
Cxt
• Power = Voltage x Current
• Increasing Voltage or Current means
the rate of energy transfer increases
A Kettle uses 2300 Watts of power. If it is switched on for 5 minutes how much energy
does it use?
The Kettle runs of mains electricity, What current does the kettle draw?
Back to the equations
Parallel and Series Circuits
Remember !
Current
Voltage
series
circuit
same
everywhere
split up between
components
parallel
circuit
splits up
between
branches
same across
each branch
Who wants to be a millionaire
• GAME 1
• GAME 2