This video discusses series circuits. It defines key terms like current, voltage, resistance and their relationships in a series circuit. Specifically: - Current is the same throughout a series circuit. The total voltage is equal to the sum of the individual voltages in the circuit. - Current is defined as the rate of flow of electric charge. Voltage is defined as the energy transferred per unit charge. - Equations are provided showing that in a series circuit, the current is the same through all components and the total voltage is equal to the sum of the voltages across individual components.

1. http://www.youtube.com/watch?v=-n1pSHzdahc

2. Series circuits
29 January 2015
The cards have
keywords with more
scientific definitions,
can you match them
up?

3. The opposition to the flow of
current
The rate of flow of charge
How much energy each charge
carries
All components are in
a single branch
Components are in
multiple branches

6. Aims
• State the equations of current
and voltage in a series circuit
• Describe the changes in
current and voltage in a series
circuit
• Define current and voltage

10. For a series circuit:
321 IIII 
The current is the same
throughout the circuit

11. Current is the rate of flow of charge
t
Q
I 

12. Current
The number of
Coulombs flowing
past a point in the
circuit every second.
I = Q/t
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A
I’m counting
how many
coulombs of
electrons go
past me every
second
1 Amp = 1 coulomb per second

15. 321 IIII 
321 VVVV 

18. For a series circuit:
321 VVVV 
The total voltage is the sum
of the individual voltages

19. Voltage(emf)
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V
I’m checking the
difference in
energy (per
coulomb) between
the 2 red arrows
1 Volt = 1 Joule per coulomb

20. Voltage (p.d.)
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V
I’m checking the
difference in
energy (per
coulomb) before
and after the lamp
1 Volt = 1 Joule per coulomb

21. Voltage is the energy transferred per charge
Q
W
V 

22. 321 IIII 
321 VVVV 

24. I have learned:
I have learned: