a parallel circuit with two bulbs electricity model a series circuit with two bulbs introducing the...
TRANSCRIPT
A parallel circuit with two bulbs
Electricity model
A series circuit with two bulbs
Introducing the model
Things to think about
Contents
click here to close the switch
switchoff!
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Model
click here to open the switch
click here to increase voltagepush!
switchon!
dim bulb
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click here to open the switch
click here to decrease voltagepush!
switchon!
bright bulb
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click here to close the switch
switchoff!
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Series circuit
click here to open the switch
push!
switchon!
very dim bulbs
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Series circuit
click here to close the switch
switchoff!
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Parallel circuit
click here to open the switch
push!
switchon!
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Parallel circuit
The flow of electricity is called the current.
Ammeters are used to measure this current (symbol )
• Where in the circuit do you have to place an ammeter to measure the flow of electricity?
The energy (or push) on the charges is called the voltage.
Voltmeters are used to measure this voltage (symbol )
When the charges are in the bulb they transform their energy into thermal energy (heat) and light energy.
• Where in the circuit do you have to place a voltmeter to measure energy lost from the circuit in the bulb?
Things to think about…1
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A
V
Remember: the flow of electricity is called the current.
Look back at the first circuit.• What do you notice about the current along all four sides
of the circuit?
• What do you notice about the current when the voltage is increased?
Now look at the series circuit.• What do you notice about the current when you put two
bulbs together in series?• Is the current larger or smaller when you put more bulbs
in a circuit?
Things to think about…2
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Remember: the flow of electricity is called the current.
Now look at the parallel circuit.• What do you notice about the current when you put two
bulbs together in parallel?• Is the current after the first branch in the circuit larger or
smaller than the current before the branch?• What happens at the second branch in the circuit?
In which circuit will…a) The cell run out of energy first?b) The cell run out of energy first?
• Why do you think this?
Things to think about…3
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