1. SERIES CIRCUITS
Type your answers in the black boxes and check them with the correct
answers on the last slide

2. Rules Current is the same through all the components
Voltage is shared out across the components
The resistance of components adds together
Potential difference = current x resistance
volts = amps x ohms

3. - - - - - - - - - - - - - - - -

4. - - - - - - - - - - - - - - - - 3A 3A THE CURRENT IN A SERIES
CIRCUIT IS THE SAME AT
EVERY POINT. - - - - - - - - 3A 3A 3A

5. - - - - - - - - What happens if one lamp is unscrewed?
No current flows if there is a gap in the
circuit

6. - - - - - - - - What happens if one cell is turned around?
(cells provide a pd to push the charge)
Reversing the cell reverses the pushing effect

7. - - - - - - - - What happens if another cell is added
the same way as the others?
Increasing the pd in the same direction
increases the pushing effect on the charges

8. - - - - - - - - What happens if another cell is added
the other way to the others?
Adding pd in the opposite direction makes
the pushing effect on the charges less

9. - - - - - - - - What happens if another bulb is added?
Adding a bulb adds resistance to the flow
of charge

10. - - - - - - - - - - - - - - - -
What happens if both cells are turned around?
The pd pushes the current the other way but
the brightness of the bulbs remains the same.

11. - - - - - - - - 6V battery Adding resistors in series is 3A
Question 1 Using the equation for current (I) we
can work out that 3Amps of
current will be flowing
6V battery - - -
Adding resistors in series is
dead easy- the total resistance
is now 6 Ohm 3A - -
2 Ohm
4 Ohm - - -
Equations
V = I x R I = V/R R = V/I
Divide the voltage by the total resistance
and type your answer with units in the box

12. - - - - - - - - 12V battery 1A R R Total Resistance = Value for R =
Question 2 - - - 1A - -
Work out the total resistance of the circuit
and a value for R R R - - -
Equations
V = I x R I = V/R R = V/I
Total Resistance =
Value for R =

13. - - - - - - - - 12V Equations V = I x R I = V/R R = V/I 3A A
Question 3 - - -
12V
Equations
V = I x R I = V/R R = V/I - - 3A A
I = 12/4 = 3A - - -
1 Ohm
3 Ohm V V V V
Notice that the circuit is NOT affected by the
meters and the resistors are still in series
pd across
the 1 Ohm
resistor
pd across
the 3 Ohm
resistor

14. Rules you should remember and be able to use:-
Current is the same through all the components
Voltage is shared out across the components
The resistance of components adds together
Potential difference = current x resistance
volts = amps x ohms

15. Question 2 Total Resistance = 12/1 = 12 Ohms
answers
Question Amp
Question 2 Total Resistance = 12/1 = 12 Ohms
If the resistors are both the same
then R = 6 Ohms
Question 3 PD across 1 Ohm resistor = 3 Volts
PD across 3 Ohm = 9 Volts

16. END