1. Circuits

4.
HEWITT PARALLEL
Hewitt resistance in circuits

7. Circuits

8. Parallel circuit

9. Parallel circuit

10. Parallel circuit CURRENT

11. Parallel circuit RESISTANCE

13. Parallel circuit RESISTANCE

14. Parallel circuit RESISTANCE

16. Parallel circuit VOLTAGE

17. Parallel circuit VOLTAGE

18. SUMMARY Series Parallel Current I=V/R Voltage V= IR Resistance R=V/I
Same at all parts of the circuit
FIND THE TOTALS FIRST IF YOU CAN… MAKES IT EASIER
It = I1 = I2= I3…
Is shared between all parts.
It = I1 + I2+ I3…
Voltage
V= IR
Vt = V1 + V2+ V3…
Same at all parts
Vt = V1 = V2= V3…
Resistance
R=V/I
Add them all up to find your total resistance.
Rt = R1 + R2+ R3…
Take the reciprocal
1 = …
Rt R1 R2 R3

20. In a parallel circuit, each current path is called a branch.
The presence of branch lines means that there are multiple pathways by which charge can traverse the external circuit.
In parallel circuits, each branch shares a direct connection to a battery.

21. 3 light bulbs connected to
a battery in a parallel circuit.
The same parallel circuit
as a circuit diagram.

22. Twice as many cars can travel on a double road, three times as many on a three-lane road and so on.
One could say that these two roads are parallel to each other in that there is more than one path for the cars to follow.
This analogy can be applied to parallel circuits.

23. Rules for Parallel Circuits
The voltage is equal across all components in the circuit. All components share the same voltage. The voltage drops of each branch equals the voltage rise of the source.
The voltage across R1 is equal to the voltage across R2 which is equal to the voltage across R3 which is equal to the voltage across the battery.

24. The current divides into separate branches such that the current can be different in every branch.
The total current is equal to the sum of the individual branch currents.
It is still the same amount of current, only split up into more than one pathway.

25. The total current is equal to the sum of the currents in the branches.
Itotal = I1 + I2 + I

26. When resistors are connected in parallel, the
total resistance of the circuit decreases.
The more branches you add to a parallel circuit, the lower
the total resistance becomes.
The total resistance of a parallel circuit is always
less than the value of the smallest resistor.

27. Simple Circuits Series circuit Parallel circuit All in a row
1 path for electricity
1 light goes out and the circuit is broken
Parallel circuit
Many paths for electricity
1 light goes out and the others stay on

29. Make a motor
Light Switch