Topic 9 Series and Parallel Circuits Flashcards
In a series circuit, if more light bulbs are added, the bulbs become A dimmer B brighter C hotter D more resistant
A Dimmer
Current is…… A the amount of energy a cell pushes out B the flow of charge in a circuit C measured in volts D measured in ohms
B The flow of charge in a circuit
Bulbs in series
The current is ……………………… because the ………………… find it difficult to travel through both bulbs. We say there is a high ………………………..Adding another bulb in series would make them ……………..
Voltage small batteries electrons bright resistance Larger dimmer easier
The current is smaller because the electrons find it difficult to travel through both bulbs. We say there is a high resistance. Adding another bulb in series would make them dimmer.
Bulbs in parallel
Both bulbs are connected directly across the two cells, therefore they are given the full ……………. The electrons find it …………………….. to flow around the circuit and the current is ………………. If a third bulb was connected in parallel they would all still be as …………………
Voltage small batteries electrons bright resistance Larger dimmer easier
Bulbs in parallel
Both bulbs are connected directly across the two cells, therefore they are given the full voltage. The electrons find it easier to flow around the circuit and the current is larger. If a third bulb was connected in parallel they would all still be as bright.
If switch K is open, which light bulbs will work?
None
If switch M is open, which light bulbs will work?
x and z
Look at the three circuit diagrams. Rank the circuits from brightest bulb to dimmest bulbs.
Circuit 1 brightest
Circuit 2 bright
Circuit 3 dim
Why does the 1st circuit have the brightest bulb, and the 3rd circuit the dimmest bulb?
1st Circuit - has the least resistance, therefore the higher current, therefore the brightest bulb.
3rd Circuit - has the highest resistance, therefore the lowest current, therefore the dimmest bulb,
Look at the three circuit diagrams. Rank the circuits from brightest bulbs to dimmest bulbs.
1st Circuit Dimmest
2nd Circuit Bright
3rd Circuit Brightest
Why does the 1st circuit have the dimmest bulb, and the 3rd circuit the brightest bulb?
1st Circuit No parallel branches, therefore highest resistance, therefore dimmest bulb.
2nd and 3rd Circuit Adding resistors in parallel lowers overall resistance, therefore current is greater, therefore the bulbs are brighter.
When resistance increases, the current …………………..,which means bulbs are ……………….
When resistance increases, the current decreases, which means bulbs are dimmer.
When resistance decreases, the current …………..…, which means bulbs are ……………….
When resistance decreases, the current increases…which means bulbs are brighter.
Resistors in series: the overall current ……………………. each time a resistor is added.
Resistors in series: the overall current decreases each time a resistor is added.
Resistors in parallel: the overall current ………………………… when more resistors are added in parallel.
Resistors in parallel: the overall current increases when more resistors are added in parallel.
Series connection
Where electrical components are connected one after another, and there is only one pathway for the current to flow through.
