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A parallel circuit with two bulbs

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# A parallel circuit with two bulbs - PowerPoint PPT Presentation

Electricity model. Contents. Introducing the model. A series circuit with two bulbs . A parallel circuit with two bulbs . Things to think about . Model. switch off!. click here to close the switch. Return to menu. click here to increase voltage. push!. switch on!.

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Presentation Transcript

Electricity model

Contents

Introducing the model

A series circuit with two bulbs

A parallel circuit with two bulbs

Things to think about

Model

switch

off!

click here to close the switch

Return to menu

click here to increase voltage

push!

switch

on!

click here to open the switch

dim bulb

Return to menu

click here to decrease voltage

push!

switch

on!

click here to open the switch

bright bulb

Return to menu

Series circuit

switch

off!

click here to close the switch

Return to menu

Series circuit

push!

switch

on!

click here to open the switch

very dim bulbs

Return to menu

Parallel circuit

switch

off!

click here to close the switch

Return to menu

Parallel circuit

push!

switch

on!

click here to open the switch

Return to menu

Things to think about…1

A

V

• 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?

Return to menu

Things to think about…2

• 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?

Return to menu

Things to think about…3

• 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…
• The cell run out of energy first?
• The cell run out of energy first?
• Why do you think this?

Return to menu